Validating Hair Diameter Diversity in Androgenetic Alopecia via Hair Diameter Distribution Analysis

July 2025 in “ Journal of the American Academy of Dermatology ”

Hee Ung Park, Kyung Bae Chung, Hyun Woo Jang, E. Kim, Byung Cheol Park, Do Young ‍Kim

hair diameter diversity androgenetic alopecia vertex of the scalp miniaturized hairs AGA

TLDR Hair diameter diversity helps assess hair loss, but its standard measure varies by individual and ethnicity.

The document discusses the use of hair diameter diversity (HDD) as a detailed assessment tool for androgenetic alopecia (AGA), particularly at the vertex of the scalp. HDD measures the proportion of thin, miniaturized hairs, with a threshold of HDD ≥20% often indicating miniaturization. However, the standardization of this threshold is debated due to individual and ethnic variations in defining "thin" hair.

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