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- Presentation
Diagnostic Pearls for Alopecia Areata: Scalp Variants, Nail Findings, and Differential Diagnosis
Description
The lecture reviews diagnostic pearls for alopecia areata, emphasizing that the condition can present in several scalp patterns and should be recognized early, with a low threshold for biopsy when the diagnosis is uncertain—especially in Black women or when other alopecias may coexist. Classic patchy AA, alopecia totalis, alopecia universalis, ophiasis, and sisypho-pattern hair loss are discussed, along with the need to distinguish AA from conditions such as traction alopecia, frontal fibrosing alopecia, lichen planopilaris, central centrifugal cicatricial alopecia, and androgenetic alopecia. Nail involvement in AA is highlighted as a marker of poorer prognosis, commonly seen as superficial pitting or trachonychia, more often affecting fingernails and children. The talk briefly notes trichoscopic clues like exclamation point hairs. A key warning sign is regrowth occurring alongside expansion of hair loss, which suggests impending worsening and should prompt more aggressive treatment.
Conclusions
- Alopecia areata has several recognizable scalp variants, but atypical presentations should prompt a low threshold for biopsy to confirm the diagnosis.
- Biopsy is especially important when the clinical picture is uncertain or when traction alopecia or scarring alopecia may coexist, particularly in Black women.
- Nail findings such as pitting and trachyonychia can support alopecia areata and often suggest more severe disease and a poorer prognosis.
- Trichoscopy can help identify classic features like exclamation point hairs, black dots, yellow dots, tapered hairs, and Pohl-Pinkus constrictions.
- A solitary patch of hair loss that is not behaving as expected should not be assumed to be alopecia areata without reconsidering the differential diagnosis.
- Recognizing when the pattern is actually another disorder, such as CCCA, LPP, traction alopecia, or AGA, prevents mismanagement and inappropriate treatment.
- When alopecia areata shows regrowth in one area while expanding elsewhere, it may signal impending rapid worsening and the need to escalate treatment quickly.
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