They are often found in the face, the postauricular area, the neck and the trunk. The lesions are usually single, although several cysts are found in some patients. Sometimes they appear in the palms and soles after an injury.
The epidermal cysts grow slowly to some size and then persist for a lifetime. They have a thin wall and have tendency to rupture. When they break, local inflammation is induced, which usually subsides and the cyst regresses. Scar tissue is often formed, which makes excision of the cyst difficult.
The epidermal cysts are recommended to be removed surgically entirely along with their wall to avoid the aforementioned complications and for aesthetic reasons.