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Retronychia: proximal ingrowing of the nail plate
David A de Berker1, Bertrand Richert, Edith Duhard
1Bristol Dermatology Centre, Bristol Royal Infirmary, Bristol, United Kingdom. david.deberker@ubht.nhs.uk
Retronychia is a newly identified nail condition where the nail grows backward into the proximal nail fold, causing inflammation. Treatment involves nail avulsion and medical management for relief.
Area of Science:
- Dermatology
- Nail Biology
Background:
- Proximal nail fold inflammation has diverse causes.
- Posterior nail embedding was not previously recognized as a cause of inflammation.
Observation:
- A novel nail ingrowth pattern, termed retronychia, is described.
- Retronychia involves proximal nail plate ingrowth into the proximal nail fold.
- Multiple misaligned nail plate generations are associated with this condition.
Findings:
- Retronychia can result from trauma disrupting longitudinal nail growth.
- This leads to reverse nail plate embedding, causing pain and inflammation.
- Granulation tissue formation may occur.
Implications:
- Retronychia is a specific cause of proximal nail fold paronychia.
- Nail plate avulsion and medical management offer a curative solution.
- Understanding this condition aids in diagnosing and treating specific nail fold inflammations.
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