Epidermal Inclusion Cyst after Fat Injection: A Case Report

Kim, Hong Il; Hwang, So Min; Song, Jennifer K; Lim, Kwang Ryeol; Jung, Yong Hui; Ahn, Sung Min

Abstract

Epidermal inclusion cysts are caused by an implantation of the epidermal elements. Primary or congenital epidermoid cysts are related to implantation of ectoderm at time of closure of the neural groove, or of other epithelial lines. Secondary or acquired epidermoid cysts are usually caused by post traumatic or iatrogenic inclusion of surface epithelium. We are reporting a case of secondary epidermoid inclusion cyst on left nasolabial fold after fat injection, which is extremely rare. A 57-year-old female patient presents with gradually progressive protruding palpable mass on left nasolabial fold. The patient had history of fat injection 1 year before, and mass was found under the previous fat injection site. There was no other history of trauma. The mass was excised and histological examination confirmed the diagnosis of an epidermoid cyst. Secondary epidermoid cysts are rare and occur mainly in the fingers, palms, and soles. The cause of secondary epidermoid cysts has been reported following trauma, radiotherapy, and after surgical procedures such as needle biopsy. During fat injection, needle injection may cause disruption of the epithelium and leading to the occurrence of this cyst. So. we suggest a careful procedure during fat injection.