Tufted angioma is a rare, noncancerous growth of small blood vessels in the skin and sometimes deeper tissue. It most often appears in infants and children, but it can also start later in life. The early symptoms of tufted angioma often include a slowly enlarging red, purple, or brown patch or plaque that may feel warm, tender, or sweaty. Not everyone will have the same experience, and many people with tufted angioma live with it for years because it can persist or grow slowly over time. Tufted angioma is usually not life-threatening, and treatment may include careful monitoring, pain relief, medicines, laser therapy, or surgery in selected cases.
How many people live with Tufted angioma?
Tufted angioma is so rare that there is no single direct headcount, but Orphanet lists it as affecting fewer than 1 in 1 million people, which suggests fewer than about 8,000 people worldwide (Orphanet, 2024). Using that same very rare rate and current U.S. population totals, the best estimate is fewer than about 340 people in the United States, although this is an estimate rather than a direct count (Orphanet, 2024; U.S. Census Bureau, 2024).
Overview
Tufted angiomaSymptoms
Tufted angioma usually appears as a slowly growing red, purple, or brown patch, plaque, or raised bump on the skin. It can feel warm, tender, or sweaty. Some areas also grow extra fine hair.
Outlook and prognosis
Tufted angioma often grows slowly in childhood, then may stay stable for years or gradually fade. Outlook is usually good, but some people with tufted angioma need monitoring for pain, sweating, or low platelets.
Causes and risk factors
Tufted angioma usually has no clear cause. Most cases happen sporadically, often from birth or in early childhood, with no known lifestyle risks; rarely, hormonal changes such as pregnancy may influence growth.
Genetic influences
Genetics do not seem to play a major role in most cases of tufted angioma. Most are not inherited, though some tufted angioma lesions may involve gene changes that happen only in the affected tissue.
Diagnosis
Tufted angioma is usually diagnosed from its appearance on the skin and how it changes over time. Doctors may use ultrasound or MRI, and sometimes a skin biopsy, to confirm the diagnosis of tufted angioma.
Treatment and drugs
Tufted angioma is often watched closely if it is small and not causing problems. When it grows, hurts, or affects clotting, treatment may include medicines such as sirolimus or steroids, and sometimes laser therapy or surgery.
Symptoms
Tufted angioma often first shows up as a small red, purple, or brown area on the skin that slowly becomes thicker or more noticeable over time. You might notice small changes at first, such as a spot that feels warmer, tender, or slightly swollen after rubbing against clothing. The early symptoms of tufted angioma can be easy to mistake for a bruise, birthmark, or irritated patch of skin. Some growths stay fairly stable, while others become uncomfortable or expand slowly.
The area is often red, purple, or brown and may look like a bruise or birthmark that does not fade. It can have uneven edges and may stand out more after friction or temperature changes.
Many people with tufted angioma develop a flat but thickened patch or a slightly raised area on the skin. It may feel firmer than the surrounding skin, almost like a small area of swelling that does not fully go away.
The spot can be sore to touch or ache on its own, especially if clothing rubs against it or if pressure builds up there. Day to day, it can feel like a tender bruise that keeps getting bumped.
Some areas feel warmer than nearby skin because of increased blood flow in the growth. The skin over it may also sweat more than usual or grow thicker, darker hair.
How people usually first notice Tufted angioma?
How tufted angioma is first noticed often starts with a slow-growing patch or plaque on the skin that looks red, purple, or brown and may feel warm, firm, or slightly raised. In many living with tufted angioma, the first signs of tufted angioma appear in infancy or early childhood, when parents or doctors notice that the area is becoming thicker, more tender, or more noticeable over time rather than fading away. Some people also first notice pain, sweating over the spot, or extra fine hair growing there, which is often what prompts a medical visit.
Types of Tufted angioma
No distinct types of tufted angioma are widely recognized.
Can I slow down the onset of symptoms?
At this time, there is no good evidence that lifestyle changes or medicines can delay or prevent the start of symptoms from tufted angioma, a rare growth of small blood vessels in the skin. Because it usually appears on its own, often in childhood, things like diet, exercise, sleep, or supplements have not been shown to meaningfully change when it starts, although research in this area is still limited. The most helpful step is to have any new painful red or purple skin patch checked early, since treatment may help manage symptoms if they appear, even though it cannot promise prevention.
What genetics can tell you about symptoms
For people living with tufted angioma, genetics currently has a limited role in predicting day-to-day symptoms. Some cases have been linked to gene changes that happen only in the affected tissue, rather than being inherited, but these findings do not yet reliably tell doctors which symptoms will appear, how severe the condition will be, or exactly when it will start. In practice, symptoms are still understood mainly by the size, depth, and location of the growth, and by whether complications such as pain, sweating over the area, or low platelet counts develop.
Causes and risk factors
Tufted angioma starts when a small patch of blood vessels in the skin grows in an unusual way. The exact causes of tufted angioma are often unclear, but some cases involve a gene change in the tumor cells that is not usually inherited from a parent. It is most often seen at birth, in infancy, or in early childhood, though some people develop it later. Hormone changes such as pregnancy and, less often, skin injury may help trigger growth, and researchers are still learning how these pieces fit together. No clear lifestyle habits are known to cause tufted angioma, so this is not something most people could have prevented.
What are the most common causes or risk factors?
The exact cause of tufted angioma is usually not known. It most often appears in babies and young children, sometimes already at birth, and in some people it seems to be related to random changes in blood vessel cells that happen by chance rather than being passed down in a family. Most people living with tufted angioma do not have a clear outside risk factor, although rare cases may start or grow during pregnancy or after a minor injury.
Environmental and biological risk factors
Tufted angioma is a rare, noncancerous growth of small blood vessels that usually shows up in babies, children, or young adults. The exact cause is not well understood, so the known risk factors for tufted angioma are limited. Doctors often group risks into internal (biological) and external (environmental), but for tufted angioma, biological factors are much clearer than environmental ones.
Tufted angioma most often begins at birth or during infancy and early childhood. This makes very young age the clearest biological risk factor.
Some cases first appear or become more noticeable during pregnancy or around puberty. This suggests hormone shifts may help trigger tufted angioma in a small number of people.
A few reports describe tufted angioma appearing after local trauma, irritation, or inflammation in the skin. This link is not strong, so it is considered a possible trigger rather than a proven cause.
Rare adult cases have been seen in people with major changes in immune function, such as after organ transplant. This association is uncommon and not firmly established.
Genetic risk factors
Most cases of tufted angioma are not inherited from a parent. Instead, the growth usually seems to start from a gene change that appears only in the affected blood-vessel cells after conception. Many families ask whether tufted angioma is inherited, and in most cases the answer is no. Carrying a genetic change doesn’t guarantee the condition will appear.
GNA14 gene: Researchers have found changes in a gene called GNA14 in some tufted angiomas. These changes can drive extra growth in small blood vessels and help form the lesion.
Somatic mosaicism: In many cases, the genetic change is present only in the angioma and not in the rest of the body. This pattern, called mosaicism, helps explain why tufted angioma is usually limited to one area.
Family history: A strong inherited pattern has not been established for most people with tufted angioma. Many are the only affected person in the family, so the chance of passing it on is usually considered low.
Inherited syndromes: No single inherited syndrome is a well-established genetic cause of tufted angioma. Because this condition is rare, research is still ongoing to see whether uncommon inherited factors play a part in a small number of families.
Lifestyle risk factors
Tufted angioma is not caused by lifestyle habits, but daily routines can influence pain, swelling, bleeding, and skin irritation around the lesion. In some people, these habits may also affect the chance of complications such as ulceration or worsening tenderness. Because evidence is limited, advice is usually based on symptom patterns and lesion location rather than on a single standard plan. Understanding how lifestyle affects tufted angioma can help people reduce triggers that make the area more uncomfortable.
Repeated rubbing from tight clothing, seams, or straps can irritate a tufted angioma and make it more painful or inflamed. Reducing friction may help limit tenderness, surface breakdown, or minor bleeding.
Bumping, scratching, or contact sports can injure the lesion because the affected blood vessels are fragile. Protecting the area may lower the risk of bruising, bleeding, or a sudden increase in pain.
Hot baths, saunas, and overheating during exercise can increase blood flow to the lesion and sometimes make it look redder, fuller, or more uncomfortable. Keeping body temperature more stable may ease throbbing or swelling in some patients.
Physical activity does not cause tufted angioma, but high-impact or lesion-specific strain can worsen discomfort if the tumor is on a pressure-bearing or frequently moving area. Lower-impact exercise or protective padding may help people stay active with fewer symptoms.
Risk prevention
There is no proven way to prevent tufted angioma, because it usually develops sporadically and its exact cause is not fully understood. For many living with tufted angioma, prevention is really about lowering the chance of pain, bleeding, skin breakdown, or other complications once a spot appears. Different people need different prevention strategies—there’s no single formula.
Tufted angioma can become sore or irritated if it is rubbed, bumped, or scratched often. Soft clothing, gentle skin care, and protecting the area during sports or play may help lower irritation and bleeding.
A new or changing reddish-purple patch or bump should be checked by a clinician, especially if it grows, hurts, or feels warm. Early assessment can help confirm whether it is tufted angioma and catch uncommon complications sooner.
Some people with tufted angioma may notice increasing pain, swelling, firmness, or easy bruising around the lesion. Prompt medical care is important if these changes appear, because they can signal a problem that needs treatment.
Repeated pressure on the area, such as from tight straps, waistbands, or rough seams, can make symptoms worse. Reducing friction may help people with tufted angioma stay more comfortable in daily life.
Can you prevent Tufted angioma?
No, there is no proven way to prevent tufted angioma. It usually develops for reasons that are not fully understood and is not known to be caused by everyday habits, so there is usually nothing people with tufted angioma or parents did to cause it.
Transmission
Tufted angioma is not an infectious condition, so it cannot be caught from someone else through touch, coughing, kissing, sex, or sharing everyday items. Many people living with tufted angioma notice that the mark or lump appeared in infancy, childhood, or sometimes later, but that does not mean it spread from another person.
When people ask about how tufted angioma is inherited, the key point is that it is usually not passed from parent to child. Most cases appear sporadically, meaning they happen by chance, and even when tufted angioma is present at birth, it is not usually linked to a family pattern.
When to test your genes
For tufted angioma, routine genetic testing is usually not part of early detection or standard care, because diagnosis is typically based on the skin findings and, when needed, a biopsy. Testing may be considered only if the lesion is unusual, multiple, or part of a broader vascular-anomaly pattern that suggests an inherited syndrome.
Diagnosis
Tufted angioma is usually diagnosed after a doctor examines a slow-growing red, purple, or brown patch, plaque, or lump on the skin and asks how it has changed over time. For many, the first step comes when everyday activities start feeling harder, such as clothing rubbing on a tender area or a child seeming bothered when the spot is touched. The diagnosis of Tufted angioma often depends on its appearance, location, and whether pain, sweating, or rapid growth are present.
Doctors look closely at the size, color, texture, and borders of the area and check whether it feels warm, firm, or tender. A careful exam can also show if the growth seems limited to the skin or may extend deeper into nearby tissue.
A detailed family and health history can help, especially to learn when the spot first appeared and whether it has grown slowly or changed quickly. Doctors also ask about pain, sweating, swelling, or easy bruising, which can affect how urgently more testing is needed.
Ultrasound is often used first to see blood flow and estimate how deep the lesion goes under the skin. If the area is large, painful, or in a sensitive location, MRI may give a clearer picture of nearby soft tissue involvement.
If the diagnosis is uncertain, a small tissue sample may be removed and examined under a microscope. This can confirm Tufted angioma by showing the typical pattern of grouped blood vessel clusters in the skin.
How is Tufted angioma diagnosed?
Tufted angioma is usually diagnosed by a skin doctor or other specialist after looking closely at the spot, asking when it appeared and how it has changed, and checking for things like pain, swelling, warmth, or extra sweating in that area. If they need more detail, they may use an ultrasound or an MRI, which are scans that help show how deep the growth goes, especially if it is large, tender, or seems to affect tissue under the skin. In many cases, the diagnosis is confirmed with a small skin sample, called a biopsy, that is examined under a microscope, and genetic testing is not usually needed.
Stages of Tufted angioma
Tufted angioma does not have defined progression stages. This is because it usually presents as a skin growth or patch that may enlarge slowly, stay stable, or sometimes partially shrink, rather than moving through clear step-by-step phases. Doctors usually start with a conversation about when the area first appeared, whether it is painful or tender, and whether there are signs such as sweating, increased hair growth, or color change, since these can be part of the early symptoms of tufted angioma. Diagnosis is often based on the skin exam, and some people also need imaging or a small skin sample under the microscope to confirm it and to monitor any change over time.
Outlook and prognosis
The outlook for people with tufted angioma is generally good, as it is a benign vascular tumor that often grows slowly and may stabilize or even partially regress over time. Many lesions persist for years but remain localized, although some can enlarge, become painful, or cause sweating or excess hair growth over the affected skin. Prognosis is more guarded when tufted angioma is associated with Kasabach-Merritt phenomenon, a rare but serious complication causing profound thrombocytopenia and clotting abnormalities that can be life-threatening without prompt treatment. Mortality is very uncommon in uncomplicated tufted angioma and is mainly linked to severe Kasabach-Merritt phenomenon rather than the tumor itself. Long-term outcomes are usually favorable with appropriate monitoring and treatment when needed, though recurrence or incomplete response can occur after therapy.
Long-term effects
For many people, tufted angioma remains a long-lasting skin and soft tissue problem rather than a life-threatening illness. The long-term picture is often shaped by where the growth is, how deep it extends, and whether it stays stable, slowly enlarges, or partly fades over time. Many living with tufted angioma have ongoing color change, thickening, or tenderness in the affected area, while a smaller group can develop more serious blood-related complications. In children, the appearance and feel of the area may change as they grow, and some effects can continue into adult life.
The affected area often remains visible for years as a red, purple, or brown patch or plaque. In some people it stays about the same, while in others it slowly enlarges or becomes more raised over time.
Tufted angioma can stay sore, sensitive, or painful, especially with pressure, friction, or bumps to the area. For many, symptoms can make everyday things like carrying a backpack or wearing snug clothing uncomfortable.
Some long-term changes involve extra sweating or increased fine hair growth over the lesion. These changes are not dangerous on their own, but they can persist and make the area feel noticeably different from nearby skin.
When tufted angioma is larger or extends deeper under the skin, it can cause ongoing puffiness, firmness, or a heavy feeling. If it sits near a joint, some may find movement becomes uncomfortable or a bit limited over time.
How is it to live with Tufted angioma?
Living with tufted angioma can range from barely noticeable to deeply disruptive, depending on where it appears and whether it causes pain, tenderness, sweating, warmth, or a patch that slowly thickens over time. Many people with tufted angioma live well, but daily life can be harder when the lesion rubs against clothing, limits movement, affects sleep, or draws unwanted attention because of its color or size. For families and other close supporters, the condition can bring worry, extra medical visits, and ongoing monitoring, especially because some cases need follow-up for growth or rare complications, yet it helps to remember that tufted angioma is usually benign and many people do well with careful care and specialist guidance.
Treatment and drugs
Tufted angioma is usually treated based on its size, location, symptoms, and how quickly it is changing, because some spots stay fairly stable while others become painful, tender, or start to affect movement. For many people, treatment begins with small daily steps, such as watching the area closely, managing discomfort, and protecting skin that rubs on clothing or gets bumped. If a tufted angioma is causing pain, swelling, repeated bleeding, or other problems, doctors may recommend medicines to reduce symptoms, laser treatment, or surgery when the growth can be removed safely. Some people, especially those with a larger or more active tufted angioma, may need care from a skin specialist, surgeon, or blood vessel specialist, and treatment may need to be adjusted over time. Because the best choice depends on the exact pattern of the angioma and any related complications, it is important to talk with your care team about the safest options for you.
Can you cure Tufted angioma?
There is no sure cure for tufted angioma, but many cases can be managed very well, and some spots slowly shrink or fade on their own over time. Treatment depends on how large it is, where it is, and whether it causes pain or other problems, and may include careful monitoring, laser treatment, surgery, or medicines to help control symptoms and slow or reduce its growth.
Non-drug treatment
A tufted angioma can range from a small skin patch that stays quiet to a tender area that swells, aches, or rubs against clothing. Managing this condition often means balancing comfort, appearance, and careful follow-up rather than rushing into treatment. Many living with tufted angioma want to know how tufted angioma is treated without surgery, and the answer often includes monitoring, skin protection, and symptom-focused procedures. The right plan depends on size, location, growth, and whether the lesion is causing pain, bleeding, or problems with movement.
Small tufted angiomas that are stable and not causing symptoms may only need regular checkups. This helps your care team track any changes in size, color, pain, or swelling over time.
Gentle skin care and avoiding friction can help if the area gets sore, irritated, or bleeds easily. Soft clothing, careful shaving, and protecting the spot during sports or play may reduce day-to-day discomfort.
Compression garments or wraps may help reduce tenderness and swelling, especially on an arm or leg. They need to be fitted carefully so they support the area without causing extra irritation.
Laser therapy, most often pulsed dye laser, may be used to lighten redness and sometimes ease pain in superficial lesions. Several sessions are often needed, and results can vary from one person to another.
Your genes may have an impact on how drugs work for you
For people with tufted angioma, there is not yet a well-established role for inherited gene testing to predict which medicine will work best or cause side effects, so doctors do not usually choose treatment based on this. In real life, response tends to depend more on things like how big the growth is, where it is on the body, and whether it is causing problems such as pain, swelling, or changes in blood clotting. This means two people with the same condition may still respond differently to medicines, but that difference is not usually explained by a genetic test that is used in routine care today.
Pharmacological treatments
Treatment for tufted angioma depends on how much it is affecting daily life, such as pain, tenderness, sweating over the area, or problems with blood clotting. Many people with tufted angioma do not need medicine at all, but drugs may be used when the lesion is growing, causing symptoms, or linked to low platelets. Not everyone responds to the same medication in the same way. The most used medicines are sirolimus, vincristine, corticosteroids, and in some cases antiplatelet drugs such as aspirin with ticlopidine.
Sirolimus is often the main drug treatment for tufted angioma when the lesion is painful, enlarging, or associated with platelet trapping. It can shrink the abnormal blood vessel growth and is now a common treatment for tufted angioma that is difficult to manage with surgery or observation alone. Regular blood tests are usually needed to watch for side effects such as mouth sores, infections, or changes in cholesterol and liver function.
Vincristine may be used for severe tufted angioma, especially when there is Kasabach-Merritt phenomenon with low platelets and bleeding risk. It is given by vein, usually in a hospital or specialist setting, and may help bring the vascular tumor under control. Nerve irritation, constipation, and jaw pain are among the side effects doctors watch for.
Corticosteroids such as prednisone or prednisolone have been used to calm inflammation and slow growth in some people living with tufted angioma. They may be given alone or together with other medicines, although they are often less reliable than sirolimus for long-term control. Side effects can include mood changes, higher blood sugar, stomach upset, and weight gain, especially with longer use.
Aspirin and ticlopidine are antiplatelet drugs that have been used in some cases to reduce pain and platelet trapping in tufted angioma. This approach is less common than sirolimus and is usually considered by specialists based on the lesion, symptoms, and blood test results. Because these medicines can increase bleeding risk, they should only be used with close medical guidance.
Genetic influences
Most people with tufted angioma do not inherit it from a parent, and it usually appears as a one-off change rather than something that runs strongly in families. It’s natural to ask whether family history plays a role. So far, tufted angioma is generally thought to be sporadic, meaning the gene change seems to happen only in the affected tissue after conception instead of being present in every cell of the body. Researchers have found that some tufted angiomas carry changes in a gene called GNA14, which helps control how blood vessel cells grow and signal to each other. This helps explain what causes tufted angioma in some people, but it does not mean a parent passed it on or that future children will usually be affected. For many living with tufted angioma, this means genetic testing is not routinely needed unless the diagnosis is unclear or a specialist thinks there may be a broader vascular condition involved.
Is Tufted angioma genetic?
Genetics do not seem to play a major role in most cases of tufted angioma. Most are not inherited, though some tufted angioma lesions may involve gene changes that happen only in the affected tissue.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common in the general population. Most do not have a direct effect on health and are simply part of natural human variation. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some situations, though, a single well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
When tufted angioma is painful, growing, or causing a drop in platelets, treatment is chosen mainly around those day-to-day concerns rather than around inherited genes. Some tufted angiomas have changes in a growth-signaling gene called GNA14, but these are usually changes in the tumor cells themselves, not a genetic condition passed through a family. Not every difference in response is genetic, but this research helps explain why medicines that calm abnormal blood vessel growth, such as sirolimus in selected cases, may help some people living with tufted angioma. For now, there is no well-established pharmacogenetic test that can tell doctors ahead of time which drug will work best for tufted angioma or which side effects are most likely. If you are looking into genetic testing for tufted angioma treatment, it is usually considered only in unusual cases or research settings, while most care still depends on symptoms, exam findings, and how the angioma changes over time.
Interactions with other conditions
For many living with tufted angioma, the main concern is usually the skin lesion itself, but doctors also watch for a rare complication called Kasabach-Merritt phenomenon, where the growth traps platelets and clotting proteins. This can lead to bruising, tiny pinpoint bleeding spots, or unusual swelling, and it is one reason a tufted angioma may need closer follow-up than it first seems. Another important aspect is how it may link with other diseases. Tufted angioma is not usually associated with a broad pattern of internal diseases, but in some people it can overlap with clotting problems, anemia from low blood counts, or pain and limited movement if it sits near a joint or deeper tissues. Interactions can look very different from person to person, and many never develop these complications, but early symptoms of tufted angioma that seem to change quickly, become tender, or are paired with easy bleeding should be checked promptly.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Tufted angioma?
Other blood vessel skin growths and birthmarks can look a lot like tufted angioma, especially infantile hemangioma, venous malformation, and a flat red or purple birthmark sometimes called a port-wine stain. A rarer but important look-alike is a blood vessel tumor called kaposiform hemangioendothelioma, because it can also cause a firm red-purple patch or lump, pain, swelling, and sometimes problems with blood clotting.
History
Doctors did not always recognize tufted angioma as its own condition. Early reports grouped these unusual skin growths with other blood vessel birthmarks and benign vascular tumors, which made diagnosis confusing for many living with tufted angioma. In recent decades, awareness has grown, and this has helped clinicians separate tufted angioma from look-alike conditions that can appear as a slow-growing reddish or purplish patch, plaque, or lump on the skin.
The condition was first described in Japan in the mid-20th century, when physicians reported a rare vascular growth in children and young adults. At the time, it was given a different medical name, because doctors were still classifying these growths mainly by how they looked under the microscope. Later, specialists noticed a very distinctive pattern of small clumps of blood-vessel cells scattered through the skin. That “tufted” appearance is what led to the modern name tufted angioma.
As pathology and skin imaging improved, doctors became better at telling tufted angioma apart from infantile hemangiomas and other vascular lesions. This mattered in everyday care. For example, a child with a slowly enlarging tender patch on the neck or shoulder might once have been told it was another kind of birthmark, while today the pattern is more likely to be recognized earlier and followed more closely.
Over time, the history of tufted angioma has also become linked with a better understanding of its possible complications. Clinicians learned that while many cases stay localized and benign, some can be painful, warm, or associated with sweating or extra hair over the area, and a small number can be tied to a serious clotting problem called Kasabach-Merritt phenomenon. Knowing that history helps explain why doctors now watch some lesions more carefully than in the past.
Researchers later identified that tufted angioma has a biological basis in how blood vessels grow, but the condition remains uncommon, so much of what is known has come from careful case reports and long-term follow-up rather than very large studies. Even so, the overall picture is much clearer than it once was: tufted angioma is now recognized as a distinct, usually noncancerous vascular tumor with a characteristic appearance, a typical clinical course, and a need for individualized follow-up.