B. Epidermoid cyst
Epidermoid cysts (ECs) are classically small, benign, cystic masses with 32% of lesions occurring in the head and neck.1 They usually arise because of failure of primitive epithelial cells to separate from underlying deep tissue during branchial arch formation.2 True ECs are fluid-filled lesions lined by simple squamous epithelium and a layer of keratin. They have been referred to by other terms such as epidermal cysts, epidermal inclusion cysts, sebaceous cysts, and seborrheic cysts. However, the terms “seborrheic cysts” and “sebaceous cysts” are misnomers, not synonymous with epidermoid cysts. Epidermoid cysts are normally close to the skin and can be located anywhere on the face, scalp, and neck. However, in the deep tissue planes, ECs in the head and neck make up only 1.6% to 6.9% of cases in the entire body.3