Disease directory
Epidermal cyst
Published: September 18, 2026Updated: September 18, 2026
Important: Informational content intended for healthcare professionals. It does not replace clinical evaluation or establish a doctor-patient relationship.
Overview
- Alternative names: Epidermoid cyst; epidermal inclusion cyst; infundibular cyst. (Avoid “sebaceous cyst”). Trinh 2019 .
- Historical description. Entity recognized since the 19th century; consolidation of the term due to its histological features. Brownstein 1983 .
- Epidemiology. A very common benign lesion in adults; it predominates on the face, trunk, and neck. Series of 432 cases: face > trunk > neck. Kim 2020
- Codes. ICD-10: L72.0 ; ICD-11: EK70.0 (infected EK70.00).
- Diagnostic checklist.
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Clinical presentation: subcutaneous nodule with punctum , slow growth.
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US without doubt: ovate, avascular mass, posterior reinforcement; pseudotestis/submarine ± “twinkling” . Huang 2011 , Yoon 2019 , Clarke 2016 .
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No routine labs; culture only if purulent drainage. Meister 2021 .
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Treatment/biopsy: complete excision with capsule ; defer if acute inflammation is present (drainage/anti-inflammatories). Lee 2006.
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