On its website, Johns Hopkins Medicine said sebaceous cysts were slow-growing bumps that could appear on the scalp, face, ears, trunk, back or groin. They can occur as a result of a ruptured ...

There is usually no obvious reason for the ducts to become blocked, but some people do seem more prone to forming sebaceous cysts than others. It is also a condition that can run in families.

Sebaceous hyperplasia is a harmless skin condition that occurs more commonly in people over age 60. It refers to small bumps, usually on the face, that stem from overgrown sebaceous glands.