A hemangioma is a type of birthmark. It develops shortly after birth, usually on the head or neck. It may be close to the surface of the skin or deeper below the skin.

For most, a hemangioma will grow quickly and then slowly disappear over time. It is often gone before puberty. If your child develops a birthmark that grows, talk to a doctor..

A hemangioma is a cluster of blood vessels that do not form normally. It is not known what cause hemangiomas. It is also unclear on what makes them grow, or disappear.