Trichilemmal cyst


Normal Case/Contol

GWAS of 0025246

Sibling Case/Control

No sibling GWAS available 0025246


Case Control
8519 451675

Phenotype Definition

Nontender, round and firm, but slightly compressible, intradermal or subcutaneous cyst measuring 0.5-5 cm in diameter. Trichilemmal cysts are acquired rather than congenital, and tend to appear on the scalp rather than the face, and to be intradermal rather than subcutaneous. []

Phenotype Comment

Epidermal cysts and trichilemmal cysts are clinically indistinguishable. The wall of the epidermal cyst conserves the epidermal layers, but the wall of the trichilemmal cysts, which arise from the external root sheath, shows palisading of unlayered epithelial cells. Homogeneous horny material that is further degraded to fat and cholesterol forms within both types of cysts.

Top SNP Information

Associated Diseases

ID Name Top Correlation
ICD: L720 Epidermal cyst 1/20
ICD: L721 Trichilemmal cyst 19/20