Picture of Epidermal Inclusion Cyst (EIC)
An epidermal inclusion cyst (EIC) is a benign cystic growth containing lipids (fats) and keratin. It arises from a ruptured sebaceous gland that is connected to a hair follicle (pilosebaceous gland). EICs are the most common type of skin cysts. A foul odor may be present if these cysts are ruptured or removed.
Text Reference: "Minimal Excision Technique for Epidermoid (Sebaceous) Cyst." American Family Physician.