Epidermoid Cyst of the Floor of the Mouth.

Epidermoid cysts are rare, slow-growing, benign, developmental cysts that are derived from abnormally situated ectodermal tissue. Epidermoid cysts may grow anywhere on the body and about 7% of them are located in the head and neck region. They are usually asymptomatic over years but can be symptomatic due to secondary changes or the growing size. Clinically, the lesion presents as a slow-growing asymptomatic mass, usually located in the midline, above or below the mylohyoid muscle. Surgical excision from the floor of the mouth is indicated to relieve symptoms and prevent possible infection. This swelling on the floor of the mouth can sometimes cause serious problems with difficulty for swallowing and speaking. The purpose of this report is to present a case of sublingual epidermoid cyst of the floor of the mouth.