Regarding birthmarks on babies, many parents believe they need not be overly concerned as long as they do not affect appearance. This mindset is actually incorrect, as some birthmarks may signal underlying conditions. So why do babies develop birthmarks? Which ones require no concern? Which ones warrant vigilance?
I. Why Do Babies Develop Birthmarks?
"Birthmarks" is a colloquial term with an incidence rate of about 10%, making them quite common.They result from abnormal proliferation of fetal skin tissue during development, manifesting as irregular shapes and colors on the skin's surface.
Birthmarks may be visible at birth or gradually appear within months after delivery. Most fade as the child grows, but a significant portion persists throughout life and may even enlarge with age.
II. Some Birthmarks Affect Appearance Only, Others Signal Underlying Conditions
(1) These 4 types of birthmarks generally do not affect health
1. Mongolian spots
Mongolian spots are commonly found on a baby's back, waist, and buttocks. These bluish birthmarks may be large in area or numerous in quantity. They are primarily caused by the abnormal proliferation of pigment-containing cells in the deeper layers of the baby's skin, with the pigment appearing as a grayish-blue hue through the skin.Mongolian spots are common among people of East Asian descent and typically fade by preschool age.
2. Salmon Patch
This orange-red birthmark occurs in about 33% of cases. It appears as a small, pale pink patch, often on the back of the neck, between the eyes, on the forehead, or eyelids. Most fade as the child grows.
3. Strawberry Hemangioma
Strawberry hemangiomas are typically red or purple and commonly appear on the face, scalp, back, or chest. They usually form within weeks after birth and may lie flat against the skin or be slightly raised. While they do not disappear, they pose no health risks.
4. Cavernous Hemangioma
Cavernous hemangiomas usually develop beneath the skin on the head or neck. If located deeper, the overlying skin may appear normal. They typically resolve before adolescence.
(II) These 3 Birthmarks May Signal Underlying Conditions
1. Café-au-lait Spots
These spots resemble the color of coffee with milk, appearing as light brown patches. They are often oval-shaped and commonly found on the trunk, buttocks, and legs. Except for the palms and soles, they can appear anywhere on the body, mostly developing in infants and young children before age five.A few café-au-lait spots generally pose no health concerns. However, if six or more spots appear, each larger than 1.5 cm in diameter, they may indicate neurofibromatosis and require immediate medical consultation.
2. Port-wine Stain
These birthmarks vary in size, appearing granular, round, or oval.At birth, these patches appear pinkish-red but deepen in color with age, eventually turning purplish. They commonly occur on the face and neck, often covering large areas. Caused by dilated capillaries, most will grow larger over time. If located on the eyelids, they increase the risk of glaucoma and require prompt treatment. Laser therapy is currently the most advanced method for treating port-wine stains.
3. Pigmented Nevi
Pigmented nevi are benign skin tumors composed of melanin-containing nevus cells. They commonly appear on the face, neck, and other areas, often developing during infancy. Most grow slowly or remain unchanged for years, but once present, they rarely fade.Pigmentation may appear brownish or black, typically manifesting as small, dotted moles rather than large patches. If hair grows from the surface of a pigmented nevus, it is termed a hairy nevus. Such moles tend to enlarge as the child grows and carry a certain risk of malignant transformation, necessitating early surgical removal.