proliferating trichilemmal cyst
Findings
No curated finding names proliferating trichilemmal cyst yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Proliferating trichilemmal tumor is a rare large, multinodular, usually benign, tumor that is generally located in the posterior part of the scalp in aged women (over 50 years). It first appears as a painless nodule that later grows into a solid or partially cystic tumor that is mobile over the underlying subcutaneous tissues. It can present ulceration, inflammation or even bleeding and can cause necrosis of the adjacent tissues.
Definition from the Mondo Disease Ontology (MONDO:0018850), read 2026-09-29. CC BY 4.0.
Features
3 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Epidermoid cystHPOHP:0200040
- Very frequent (80% to 99% of cases)
- Skin ulcerHPOHP:0200042
- Very frequent (80% to 99% of cases)
- Sparse scalp hairHPOHP:0002209
- Frequent (30% to 79% of cases)
Where it sits
- A kind of
Other names
9 names
Resolves to: proliferating trichilemmal cyst
- Also called
- Pilar cystPilar tumorPilar tumourproliferating Pilar tumorproliferating Pilar tumourproliferating trichilemmal tumorproliferating trichilemmal tumourproliferating Tricholemmal tumorproliferating Tricholemmal tumour