what a sebaceous cyst
A sebaceous cyst is a type of cyst that forms in the epidermis, the outermost layer of the skin. A sebaceous cyst is also sometimes called an epidermal cyst.It forms when a sebaceous gland, an oil-producing gland in the skin, becomes blocked.This creates a sac that fills with a fatty yellow substance that can resemble cottage cheese.ebaceous cysts can be present at birth or caused by skin trauma, swollen hair follicles, and high levels of testosterone. The primary symptom of a sebaceous cyst is a painless nodule or pale lump in the skin.