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.