Trichilemmal cyst
Common cyst that forms from a hair follicle / From Wikipedia, the free encyclopedia
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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]
Quick Facts Other names, Specialty ...
Trichilemmal cyst | |
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Other names | Wen, pilar cyst, or Isthmus-catagen cyst[1][2] |
Trichilemmal cyst: Note the thick, durable, white shell | |
Specialty | Dermatology |
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