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Updated: Jul 10, 2026

A Rat Model of Compound Acne
Published on: November 1, 2024
Acne arising in an epidermal nevus.
Chad M Hivnor1, Albert C Yan, Paul J Honig
1Nellis Air Force Base, Nevada 89191, USA. Chad.Hivnor@nellis.af.mil
Acne developed exclusively within a congenital epidermal nevus during puberty. This case highlights genetic mosaicism affecting pilosebaceous units in skin development.
Area of Science:
- Dermatology
- Genetics
- Developmental Biology
Background:
- Epidermal nevi are benign congenital skin growths following Blaschko lines.
- These lesions exhibit diverse histologic patterns, including hamartomatous hyperplasia of epidermal and adnexal structures.
Observation:
- A rare case of acne vulgaris exclusively manifesting within a preexisting keratinocytic epidermal nevus is reported.
- The onset of acne occurred during puberty in the affected nevus.
Findings:
- This presentation suggests localized pilosebaceous unit involvement within the epidermal nevus.
- The findings provide evidence for genetic mosaicism influencing the development and function of these units.
Implications:
- This case expands the understanding of epidermal nevi and their potential to develop specific conditions.
- It offers insights into the role of genetic mosaicism in localized pilosebaceous unit abnormalities and acne pathogenesis.
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