Nevus Sebaceous

Nevus sebaceous is a type of birthmark.

In general, this type of birthmark is an area of skin that has too many oil glands (sebaceous glands) and does not have any hair.

A nevus sebaceous gets bigger as a child grows. When a child enters puberty, teenage hormones may cause the birthmark to become more raised, thick and visible.

They are most often found on the scalp, but can also be found on the neck, face, forehead and trunk.

Nevus sebaceous is not passed down from parents (inherited). It can happen in both boys and girls, and in all ethnicities.

The surface of the birthmark may be smooth or pebbly. The shape is usually round, oval or like a line. This hairless area is often yellow, pink or yellow-orange in color.

Some people may develop growths within the birthmark. They are usually are not harmful (benign). Less than 1 out of 100 people develop a type of slow-growing skin cancer called a basal cell carcinoma inside the birthmark.

In general, these skin changes appear during the teen years or adulthood. Due to possible growths developing within the nevus sebaceous, surgical removal (excision) of the birthmark is an option.

Parents should check their child’s birthmark from time to time. Call your child’s dermatologist or another healthcare provider if you notice any changes to the skin area.