Other Types of Epithelial Cysts
Pilar or Trichilemmal Cyst (Wen). These cysts occur predominantly on the scalp, are odorless and have less fat and more keratin than epidermoid cysts. They are very amenable to removal by the minimal excision technique.
Dermoid Cyst. These congenital cysts occur in the lines of cleavage and sublingually around the eyes and on the base of the nose. These cysts have a rancid odor. The lesions can extend intracranially, and a preoperative computed tomographic (CT) scan is recommended.
Milia. These 1- to 2-mm lesions can arise spontaneously or can be caused by trauma. A small nick in the epidermis with a no. 11 blade allows expression of the keratinaceous white kernel.
Steatocystoma Multiplex. These multiple, small, yellow, cystic nodules (a few millimeters in diameter) can be found on the trunk, upper arms, axillae and thighs. The multitude of lesions may preclude cyst removal.
Favre-Racouchot Syndrome. These multiple lesions on the face result from profound sun damage. The pilosebaceous openings stretch, and the orifices fill with keratin material, producing comedones and cysts.