Epidermal cysts derived from layer of epithelium. Filled with keratin debris. Treatment consists of complete excisional biopsy. Preauricular cyst and fistula Results from faulty fusion of mesodermal hillocks that form the auricle. Fistula opening located in front of the incisura.
Recurrent infection can be troublesome.
After injection of methylene blue into the fistulous tract, the tract and cyst are excised. Benign Lesions Keloids Predisposition among Blacks. Hypertrophy of connective tissue in traumatized areas. Treatment is complete excision followed with injections of cortisone. Exostosis Periosteal outgrowths in the osseous canal of cold-water swimmers.