An epidermal inclusion cyst — also known as an epidermoid cyst, infundibular cyst, keratin cyst, or inclusion cyst — is the most common type of cutaneous cyst. Patients present with a nodule that is ...

An epidermoid cyst is a lump under the skin. Epidermoid cysts usually do not require treatment, unless a person wants to have them removed due to cosmetic reasons, or if the cyst becomes infected.

What causes an inclusion cyst to come to a head and rupture, and what effect does this have?—JUDIE HARTLEY, CRNP, BSN, Warren, Ohio An epidermal inclusion cyst or epidermoid cyst is lined with ...