Female Diffuse Non-Cicatricial Alopecia: The Diagnostic Value of Trichoscopy

The document discusses the diagnostic challenges of diffuse non-cicatricial alopecia in females and highlights the value of trichoscopy as a non-invasive diagnostic tool. Trichoscopy can often replace the need for histopathological confirmation by identifying specific patterns associated with different types of alopecia, such as telogen effluvium (TE), androgenetic alopecia (AGA), alopecia areata incognita (AAI), and diffuse alopecia areata (DAA). The report emphasizes that while TE and AGA often overlap, trichoscopy can help differentiate them by identifying signs like miniaturized hair and increased vellus hair in AGA, and upright regrowing hairs in TE. AAI and DAA can also be distinguished through trichoscopy, with AAI showing yellow dots and pigtail hairs, while DAA presents with black dots and exclamation mark hairs. The authors suggest that biopsies should be reserved for uncertain cases, and trichoscopy findings can guide the selection of biopsy sites when necessary.