Birthmarks

What are birthmarks?

Birthmarks are colored marks on the skin that are present at birth or appear during the first weeks or months of life. They are very common, and most are harmless. Some fade on their own as a child grows, while others stay for life. The word covers a wide range of different marks, so two birthmarks can look and behave very differently from each other.

Doctors usually divide birthmarks into two broad groups. Vascular birthmarks are made of extra or abnormally formed blood vessels in or under the skin. They are usually pink, red, or purple. Examples include salmon patches (sometimes called stork bites or angel kisses), infantile hemangiomas (raised, often bright red growths of blood vessels), and port-wine stains (flat, pink to dark red marks that tend to persist). Pigmented birthmarks are made of clusters of pigment cells, called melanocytes, which give skin its color. They are usually brown, black, gray, or blue-gray. Examples include congenital melanocytic nevi (moles present at birth), café-au-lait spots (flat, light brown patches), and dermal melanocytosis (flat blue-gray patches, historically called Mongolian spots, often seen on the lower back or buttocks).

Birthmarks affect babies of every background. Some types are more common in certain groups. For example, dermal melanocytosis is seen more often in babies with darker skin, while infantile hemangiomas are somewhat more common in girls, in premature babies, and in babies with a low birth weight. In most cases, a birthmark is simply a variation in how the skin formed and does not point to any wider health problem.

Birthmarks symptoms and signs

Strictly speaking, most birthmarks do not cause symptoms in the sense of pain or illness. What parents and patients notice is the appearance of the mark itself. The signs of birthmarks vary by type, and knowing the typical features can help you describe a mark accurately to a doctor.

• Salmon patch: a flat, pale pink or red patch, often on the eyelids, forehead, or back of the neck. It may become brighter when the baby cries. Patches on the face usually fade in the first years of life; those on the neck often stay but are hidden by hair.
• Infantile hemangioma: a raised, soft, bright red or bluish lump that often appears in the first weeks after birth, grows quickly for several months, then slowly shrinks over years. It is sometimes called a strawberry mark because of its color and texture.
• Port-wine stain: a flat pink, red, or purple patch that is present at birth and grows in proportion with the child. It does not fade, and over many years it may darken, thicken, or develop small bumps.
• Congenital melanocytic nevus: a brown or black mole present at birth, ranging from very small to very large. It may be flat or raised and may grow dark hair.
• Café-au-lait spot: a smooth, flat, light brown patch, often oval, with a color similar to coffee with milk. One or two are common and usually harmless.
• Dermal melanocytosis: a flat blue-gray patch, most often on the lower back or buttocks, that can look like a bruise but is not tender. It usually fades during childhood.

How birthmarks change over time is often more important than how they look at a single moment. Vascular birthmarks such as hemangiomas go through stages: a rapid growth phase, a plateau, and a slow shrinking phase. During the growth phase, a hemangioma may become tense or shiny. In some children, especially when the mark is on the lip, diaper area, or a skin fold, the surface can break down and form an open sore, called ulceration. This can be painful and may bleed or become infected. Hemangiomas near the eye can interfere with vision, and those near the airway, though uncommon, can affect breathing.

Pigmented birthmarks tend to be more stable, but they should still be watched. Any birthmark that changes rapidly in size, shape, color, or texture, or that bleeds, itches, or becomes painful, deserves a medical review.

Birthmarks causes and risk factors

The causes of birthmarks are not fully understood, and in most cases no specific cause can be identified. Birthmarks are not caused by anything a mother did or did not do during pregnancy, and they are not related to diet, stress, or minor injuries. Folk beliefs linking birthmarks to unmet cravings or frightening events have no basis in medical evidence.

What doctors do know is that birthmarks arise from small differences in how skin cells or blood vessels develop before or shortly after birth. Vascular birthmarks form when blood vessels in a patch of skin grow more than usual, cluster together, or remain widened. Pigmented birthmarks form when melanocytes gather in one area instead of spreading evenly through the skin. These changes are thought to happen in a single group of cells during development, which is why most birthmarks are limited to one area and are not passed down in families.

A small number of birthmarks are linked to genetic conditions. Several café-au-lait spots, particularly if there are six or more and they are larger than a certain size, can be a feature of neurofibromatosis type 1, a genetic condition that affects the nerves and skin. A large port-wine stain on the forehead and upper face is occasionally associated with Sturge-Weber syndrome, which can involve the eye and brain. Very large congenital moles carry a small increased lifetime risk of melanoma, a serious form of skin cancer. These associations are uncommon, and a doctor can advise whether any further checks are needed.

Known risk factors include the following:

• Premature birth and low birth weight, which are linked to a higher chance of infantile hemangioma.
• Female sex, since hemangiomas are somewhat more common in girls.
• Multiple pregnancies, such as twins.
• Darker skin, which is associated with a higher frequency of dermal melanocytosis.
• Family history, in the small number of cases where a birthmark is part of an inherited condition.

Birthmarks diagnosis

In the great majority of cases, a doctor can diagnose a birthmark simply by looking at it. Diagnosis is based on the color, shape, texture, location, and whether the mark was present at birth or appeared later. Your doctor will usually ask when the mark first appeared and how it has changed. Taking photographs at regular intervals can be very helpful, because it lets the doctor judge growth over time.

Some additional steps may be used when the type of birthmark is unclear or when there are features that need closer attention:

• Dermoscopy: a handheld magnifying device with a light that allows the doctor to see structures in the skin that are not visible to the naked eye. It is often used to assess pigmented birthmarks and moles.
• Ultrasound: a painless scan using sound waves that can show how deep a vascular birthmark extends and how much blood flow it has.
• MRI (magnetic resonance imaging): a detailed scan that may be recommended if a large vascular birthmark is near the eye, spine, or brain, or if a related condition such as Sturge-Weber syndrome is suspected.
• Eye examination: may be advised for port-wine stains around the eye, because of the risk of raised pressure inside the eye (glaucoma).
• Skin biopsy: removal of a small sample of skin for examination under a microscope. This is rarely needed for birthmarks but may be used if a mole shows unusual features.
• Genetic evaluation: may be considered when multiple café-au-lait spots or other features suggest an underlying genetic condition.

Birthmarks are usually assessed by a pediatrician or a dermatologist (a doctor who specializes in skin). At Acibadem, birthmarks are generally evaluated within the Dermatology department, working with pediatric, eye, or surgical specialists when a mark affects other structures.

Birthmarks treatment options

Most birthmarks do not need any treatment. Many fade on their own, and those that remain are often harmless. Treatment is considered when a birthmark causes a medical problem, such as affecting vision or breathing, breaking down into a sore, or bleeding, or when its appearance causes significant distress. Decisions are individual, and your doctor may recommend simply watching a mark for a period before deciding.

Observation is the most common approach. For salmon patches, dermal melanocytosis, and most small hemangiomas, doctors typically monitor the mark with regular photographs and check-ups. Because hemangiomas shrink naturally over several years, many are left to resolve on their own.

Medication is mainly used for infantile hemangiomas that are growing quickly or are in a risky location. Oral propranolol, a beta-blocker medicine originally used for heart and blood pressure conditions, is now a standard treatment and can slow growth and speed shrinkage. It requires medical supervision and monitoring of heart rate, blood pressure, and blood sugar, especially at the start. A related medicine, timolol, is sometimes applied as a gel to small, thin hemangiomas. Corticosteroid medicines are used less often than in the past but remain an option in certain situations.

Laser therapy is the main treatment for port-wine stains. A pulsed dye laser delivers light that is absorbed by the blood vessels in the mark, causing them to close without damaging the surrounding skin. Several sessions spread over months are usually needed, and results vary; the mark often becomes lighter but may not disappear completely. Treatment can be started in infancy or later. Lasers are also sometimes used to treat leftover redness or visible vessels after a hemangioma has shrunk. Certain lasers can lighten some pigmented birthmarks, although results are less predictable.

Surgery may be recommended for large or medium-sized congenital moles, particularly to reduce the small risk of melanoma or for appearance, and for hemangiomas that have left loose or scarred skin after shrinking. Very large moles may require staged surgery over time, sometimes using tissue expansion, in which a balloon is placed under nearby skin and gradually inflated to create extra skin for reconstruction. Surgery leaves a scar, and your doctor will weigh this against the benefits.

Supportive care matters too. Ulcerated hemangiomas are treated with wound care, pain relief, and sometimes antibiotics if infection develops. Camouflage make-up, available in shades for all skin tones, can help older children and adults cover marks they find distressing. Sun protection is advised for pigmented birthmarks, since ultraviolet light can darken them and adds to long-term skin cancer risk.

Living with birthmarks and outlook

The outlook for most birthmarks is very good. Salmon patches on the face and dermal melanocytosis usually fade in early childhood. Most infantile hemangiomas stop growing by around one year of age and shrink substantially over the following years, although some leave behind faint skin changes such as slight discoloration, a soft bulge, or fine surface vessels. Port-wine stains and congenital moles are permanent unless treated, and even with treatment they may not vanish entirely.

Living with a visible birthmark can affect confidence, particularly for children as they become aware of how others react. Simple, honest explanations at a level the child understands can help, as can teaching them short replies to questions from other children. Some families find it useful to speak with a counselor or to connect with support groups for people with similar marks. Adults with birthmarks on the face may find camouflage products or laser treatment helpful, but many choose to live with their marks without treatment.

Ongoing follow-up is sensible for certain types. Large congenital moles should be checked regularly, and people with them should learn what changes to look for. Port-wine stains near the eye may need periodic eye checks over the years. Where a birthmark is part of a wider genetic condition, care will involve other specialists as well. No one can promise how a specific birthmark will develop, but with appropriate monitoring, the great majority of people with birthmarks lead entirely normal, healthy lives.

Frequently asked questions

What are the most common birthmarks symptoms parents notice?

Most birthmarks do not cause symptoms beyond their appearance. Parents usually notice a flat or raised patch of color that is present at birth or shows up in the first weeks. Marks that are red or purple are usually vascular, while brown, black, or blue-gray marks are usually pigmented. Changes over time, such as rapid growth, bleeding, or an open sore, are the signs that should prompt a medical review.

What are the main birthmarks causes, and did I do something to cause them?

Birthmarks happen because of small differences in how blood vessels or pigment cells develop in one area of skin before or just after birth. They are not caused by anything a parent did during pregnancy, and they are not linked to diet, cravings, stress, or minor injuries. In a small number of cases, birthmarks are part of a genetic condition, which a doctor can assess.

How is birthmarks diagnosis usually made?

Most birthmarks are diagnosed by a doctor looking at the skin and asking about when the mark appeared and how it has changed. Further tests are only needed in some cases. Dermoscopy may be used to examine moles more closely, ultrasound or MRI may be used to look at deeper vascular marks, and an eye examination may be advised for marks near the eye.

Is birthmarks treatment always necessary?

No. Most birthmarks are harmless and either fade on their own or remain without causing problems. Treatment is usually considered only when a mark affects function, such as vision or breathing, when it breaks down or bleeds, or when its appearance is causing significant distress. Your doctor may suggest watching the mark for a time before making a decision.

Can birthmarks be removed completely with laser?

Laser treatment, particularly pulsed dye laser for port-wine stains, can make many marks noticeably lighter, but complete removal is not guaranteed. Several sessions are usually needed, and the response varies from person to person and depends on the mark’s size, location, and depth. Some marks may partially darken again over the years, and further sessions may be discussed.

Can birthmarks turn into cancer?

The vast majority of birthmarks never become cancerous. Vascular birthmarks such as hemangiomas and port-wine stains are not cancers and do not turn into cancer. Large congenital moles carry a small increased lifetime risk of melanoma, so they are usually monitored regularly, and any change in size, shape, color, or texture should be checked by a doctor.

Do birthmarks run in families?

Most birthmarks are not inherited and occur by chance in a single area of developing skin. There are exceptions: some birthmark patterns, such as multiple café-au-lait spots, can be a feature of inherited conditions like neurofibromatosis type 1. If several family members have similar marks or an associated condition, your doctor may recommend a genetic evaluation.

When to see a doctor

Any new mark on a baby’s skin is worth mentioning at a routine check-up so a doctor can identify the type and advise on whether it needs watching. Seek medical advice more promptly, and urgently if the situation is severe, if you notice any of the following red flags:

• A birthmark that is growing rapidly, especially in the first months of life.
• A hemangioma or other mark near the eye, nose, mouth, or airway, or one that seems to affect vision, feeding, or breathing.
• Noisy breathing or difficulty breathing in a baby with a hemangioma on the neck, chin, or jaw area.
• A birthmark that bleeds, develops an open sore, oozes, or shows signs of infection such as spreading redness, warmth, pus, or fever.
• A birthmark that becomes painful or that the child keeps scratching or picking at.
• Any mole or pigmented mark that changes in size, shape, color, or texture, develops irregular edges, or shows several different colors.
• Six or more café-au-lait spots, or a large port-wine stain on the forehead and upper eyelid, which may need evaluation for related conditions.
• Five or more hemangiomas on the skin, since this can occasionally indicate hemangiomas in internal organs and may warrant further tests.
• Many birthmarks over the lower spine, or a mark with a tuft of hair or a dimple over the spine, which may need imaging.

If you are ever unsure whether a birthmark is a cause for concern, it is reasonable to have it checked. A short examination can usually provide reassurance or, when needed, lead to timely monitoring or treatment.