Trichilemmal cyst: Note the thick, durable, white shell
Specialty
Dermatology
Relative incidence of cutaneous cysts: Trichilemmal cyst is labeled near top.
A trichilemmal cyst (or pilar cyst) is a common cyst that forms from a hair follicle, most often on the scalp, and is smooth, mobile, and filled with keratin, a protein component found in hair, nails, skin, and horns. Trichilemmal cysts are clinically and histologically distinct from trichilemmal horns, hard tissue that is much rarer and not limited to the scalp.[3] Rarely, these cysts may grow more extensively and form rapidly multiplying trichilemmal tumors, also called proliferating trichilemmal cysts, which are benign, but may grow aggressively at the cyst site.[4] Very rarely, trichilemmal cysts can become cancerous.[5]
^Fitzpatrick, Thomas Bernard; et al. (2003). Fitzpatrick's dermatology in general medicine (6th ed.). New York: McGraw-Hill. p. 779. ISBN 0071380760. OCLC 318263086.
^James, William D; Berger, Timothy G; Elston, Dirk M; Odom, Richard B (2006). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Philadelphia: Saunders. p. 677. ISBN 0721629210. OCLC 62736861.
^DiMaio, Dominick J.M.; Cohen, Philip R. (August 1998). "Trichilemmal Horn: Case Presentation and Literature Review". Journal of the American Academy of Dermatology. 39 (2): 368–371. doi:10.1016/s0190-9622(98)70393-7. PMID 9703156.
^Brownstein, Martin H.; Arluk, David J. (1 September 1981). "Proliferating trichilemmal cyst: A simulant of squamous cell carcinoma". Cancer. 48 (5): 1207–1214. doi:10.1002/1097-0142(19810901)48:5<1207::aid-cncr2820480526>3.0.co;2-1. ISSN 1097-0142. PMID 6268280.
^Kim, Ui Geon; Kook, Dong Bee; Kim, Tae Hun; Kim, Chung Hun (March 2017). "Trichilemmal Carcinoma from Proliferating Trichilemmal Cyst on the Posterior Neck". Archives of Craniofacial Surgery. 18 (1): 50–53. doi:10.7181/acfs.2017.18.1.50. ISSN 2287-1152. PMC 5556745. PMID 28913304.
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