ICD-11 classes
14 Diseases of the skin
Benign proliferations, neoplasms and cysts of the skin
EK70 — Cutaneous cysts
EK70.1 — Trichilemmal cyst
ICD-11 EK70.1 — Trichilemmal cyst
A trichilemmal (pilar) cyst is a common, typically non-tender, intradermal or subcutaneous cyst. The cysts are typically confined to the scalp and are often multiple. They usually occur sporadically but may be inherited in an autosomal dominant manner. They are derived from the outer root sheath of the hair follicle and as such contain keratin or keratin degradation products. Rarely, they may undergo malignant transformation.
It includes 1 item.
- Pilar cyst
The diagnosis excludes nothing.
It has no clarifying diagnoses.