Terminology
Several synonyms exist for epidermoid cysts, including epidermal cyst, epidermal inclusion cyst, infundibular cyst and keratin cyst. "Epidermal inclusion cyst" more specifically refers to implantation of epidermal elements into the dermis. Infundibular cyst refers to the site of origin of the cyst: the infundibular portion of the hair follicle. In fact, the majority of epidermal inclusion cysts originate from the infundibular portion of the hair follicle thus explaining the interchangeable, yet technically incorrect, use of these two terms.
Read more about this topic: Epidermoid Cyst