My Baby Has a Streaky or Velvety Raised Birthmark (Epidermal Nevus)
The short answer
An epidermal nevus is a benign (non-cancerous) overgrowth of skin cells that is present at birth or appears in early childhood. It typically looks like a slightly raised, skin-colored to brownish, velvety or wart-like patch that often follows a linear or streaky pattern along the body's natural skin lines (Blaschko lines). Epidermal nevi are usually isolated and purely cosmetic. However, when they are large or extensive, they can sometimes be associated with abnormalities in other organ systems (epidermal nevus syndrome), so a thorough evaluation is recommended for larger lesions.
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By Age
What to expect by age
0-6 months
Epidermal nevi may be present at birth or become apparent in the first few months as they darken or thicken slightly. In infancy, they may appear as faint, smooth, slightly raised streaks on the skin. They are painless and do not itch at this age. Your pediatrician may refer you to a pediatric dermatologist for evaluation and to distinguish it from other birthmarks.
6 months - 2 years
During this period, the nevus may become more noticeable — slightly thicker, more textured, and possibly darker. Small, isolated epidermal nevi require no treatment but should be monitored. If the nevus is large, extensive, or located on the head or face, your dermatologist may recommend evaluation for epidermal nevus syndrome, which can involve the brain, eyes, and skeleton.
2-5 years
The epidermal nevus reaches its final appearance during childhood. It does not continue to spread. If it is causing cosmetic concern or is in a location that causes irritation, treatment options include laser therapy, surgical removal, or topical treatments, though recurrence after treatment is possible. Most small nevi are simply monitored.
5 years+
Epidermal nevi are benign and the risk of malignant transformation is extremely low. They persist throughout life. If the nevus is cosmetically bothersome, discuss treatment options with your dermatologist. For children with epidermal nevus syndrome, ongoing monitoring of the brain, eyes, and skeleton is coordinated by the relevant specialists.
What Should You Do?
When to take action
- Your baby has a small, linear, slightly raised patch that has been evaluated and identified as an epidermal nevus
- The nevus is stable in appearance and not causing any symptoms
- Your child has an isolated epidermal nevus with no other health concerns
- The epidermal nevus is large, extensive, or covers a large portion of the body
- The nevus is located on the head or face — this may warrant evaluation for associated conditions
- The nevus becomes itchy, painful, or inflamed
- You notice other developmental or health concerns in addition to the skin finding
- A rapidly growing or changing nodule develops within the epidermal nevus — seek dermatologic evaluation
- Your child has seizures or neurological symptoms along with an extensive epidermal nevus — this needs urgent medical evaluation
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Skin Concerns
My Baby Has a Waxy Yellowish Patch on Their Scalp (Nevus Sebaceous)
A nevus sebaceous (also called nevus sebaceous of Jadassohn) is a benign birthmark that typically appears on the scalp as a flat or slightly raised, yellowish-orange, waxy or velvety patch where hair does not grow. It is present at birth and occurs in about 0.3% of newborns. During childhood, it remains relatively flat and inconspicuous. At puberty, it becomes thicker and more noticeable due to hormonal stimulation. There is a small risk (historically overstated) of developing benign or rarely malignant tumors within the nevus later in life, so monitoring and potential removal are discussed with your dermatologist.
My Baby Has a Vascular Malformation (Port-Wine Stain or Deeper)
Vascular malformations are structural abnormalities of blood vessels or lymph vessels that are present at birth (though some become apparent later). Unlike hemangiomas, which grow rapidly and then shrink, vascular malformations grow proportionally with the child and do not go away on their own. They are classified by the type of vessel involved: capillary (port-wine stains), venous, lymphatic, or arteriovenous. Most are benign and manageable, but the approach depends on the type, location, and whether associated conditions are present (such as Sturge-Weber syndrome with facial port-wine stains).
My Baby Has a Bump Near Their Eye or on Their Head (Dermoid Cyst)
A dermoid cyst is a benign (non-cancerous) growth that is present at birth, though it may not be noticed right away. It forms during fetal development when skin cells become trapped beneath the surface. Dermoid cysts commonly appear near the eyebrow (most common location), on the scalp, or at the bridge of the nose. They typically feel like a firm, non-tender, round lump that does not move much. While they are not dangerous, dermoid cysts do not resolve on their own and are usually removed surgically to prevent complications like infection or growth.
My Baby Has an Extra Nipple (Accessory Nipple)
Accessory (supernumerary) nipples are one of the most common minor congenital findings, occurring in about 1 in 18 people. They appear as small, flat, often pigmented bumps along the "milk line" — an embryonic line running from the armpit to the groin on each side. Most people mistake them for moles. Accessory nipples are almost always harmless and require no treatment. In rare cases, they may be associated with kidney abnormalities, so some pediatricians recommend a renal ultrasound if one is found, though this practice varies.
My Baby Was Born with a Raw Spot on Their Scalp (Aplasia Cutis)
Aplasia cutis congenita (ACC) is a condition where a baby is born with a small area of missing skin, most commonly on the scalp. It occurs in about 1 in 10,000 births. The affected area may look like a raw wound, an ulcer, or may have already healed into a thin, shiny scar by the time of birth. Most cases are small, isolated, and heal well with basic wound care — the area eventually forms a hairless scar. Larger defects or those associated with other findings may need more investigation, but isolated small ACC has an excellent prognosis.
Baby Acne vs Eczema: How to Tell the Difference
Baby acne and eczema can both cause facial rashes, but they look and feel different. Baby acne appears as small red or white bumps, similar to teenage acne, usually on the cheeks, nose, and forehead. Eczema causes dry, rough, red, itchy patches. Baby acne resolves on its own by 3 to 4 months, while eczema may need ongoing management.