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Revisiting Diffuse Unpatterned Alopecia: Reappraisal of a Controversial Diagnosis
Archie Spindler1, Derek Maas1, Isabella Zappi1,2
1The Ronald O. Perelman Department of Dermatology, New York University Grossman School of Medicine, New York, NY, USA.
Skin Appendage Disorders
|August 12, 2026
Summary
Diffuse unpatterned alopecia (DUPA) is a rare hair loss affecting the entire scalp. Medical management focuses on stabilization, as regrowth is not typical for this androgenetic alopecia variant.
Area of Science:
- Dermatology
- Trichology
Background:
- Diffuse unpatterned alopecia (DUPA) is an uncommon variant of androgenetic alopecia (AGA).
- It presents as diffuse follicular miniaturization across the entire scalp, including the occipital region.
- This distinguishes DUPA from classic patterned AGA and often makes hair transplantation unsuitable.
Purpose of the Study:
- To review the clinical presentation, diagnosis, pathophysiology, and management of DUPA.
- To highlight current understanding and identify knowledge gaps.
Main Methods:
- Literature review of available studies on DUPA.
- Analysis of clinical presentation, trichoscopic findings, and diagnostic challenges.
- Discussion of management strategies.
Main Results:
- DUPA typically presents with diffuse thinning across all scalp regions.
- Trichoscopy shows widespread follicular miniaturization without scarring.
- Diagnosis is primarily clinical; histopathologic criteria are not established.
- Mimickers include telogen effluvium and alopecia areata.
- Management focuses on stabilization with minoxidil and potential adjunctive therapies.
Conclusions:
- DUPA is a diffuse, non-patterned hair loss managed medically. Stabilization is the primary goal.
- Further research is needed to define epidemiology, pathology, diagnostic criteria, and treatment outcomes.
