A<unk>  is a term commonly used to refer to either: * Epidermoid cysts (also termed epidermal cysts, infundibular cyst) * Pilar cysts (also termed trichelemmal cysts, isthmus-catagen cysts) Both of the above types of cysts contain keratin, not sebum, and neither originates from<unk>  glands. Epidermoid cysts originate in the epidermis and pilar cysts originate from hair follicles. Technically speaking, then, they are not<unk> s. "True"<unk> s, which originate from<unk>  glands and which contain sebum, are relatively rare and are known as steatocystoma simplex or, if multiple, as steatocystoma multiplex. Medical professionals have suggested that the term<unk> " be avoided since it can be misleading. In practice, however, the term is still often used for epidermoid and pilar cysts.
Sebaceous cyst
Abscess
Tornwaldt cyst
Bartholin's cyst
Dentigerous cyst
Epidermoid cyst
Trichofolliculoma
Papillary hidradenoma