Epidermoid cyst


Normal Case/Contol

GWAS of 0200040

Sibling Case/Control

No sibling GWAS available 0200040


Case Control
12678 447516

Phenotype Definition

Nontender, round and firm, but slightly compressible, intradermal or subcutaneous cyst measuring 0.5-5 cm in diameter. Epidermal cysts are intradermal or subcutaneous tumors, grow slowly and occur on the face, neck, back and scrotum. They usually appear at or around puberty, and as a rule an affected individual has one solitary or a few cysts. [HPO:skoehler]

Phenotype Comment

A cyst is a cavity containing liquid, semisolid, or solid material. An epidermoid cyst is a benign cyst that develops out of ectodermal tissue and consists of a thin layer of squamous epithelium. An epidermal cyst may or may not be painful or release pus, and are usually noticed as a bump on the skin. 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 18/20