Several synonyms exist for epidermoid cysts, including epidermal cyst , infundibular cyst , keratin cyst and the technically incorrect, epidermal inclusion cyst .  : 778  "Epidermal inclusion cyst" more specifically refers to implantation of epidermal elements into the dermis . The term 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 inaccurate, use of these two terms. Another similar and easily confused cyst is Sebaceous cyst .