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. 2023 Jun 23;14(7):1326. doi: 10.3390/genes14071326

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Histological findings in pattern hair loss (M-AGA and FPHL). (A) Follicles miniaturization with increased vellus (V) hair follicles versus terminal hair (T) (T/V ratio = 5/3) × 20. (B) Diffuse miniaturization with increased vellus (V) hair follicles. (T/V ratio = 9/7). Increased fibrous tissue surrounding the follicles was seen. ×10. (C) Note variation in hair follicle size × 40. An increased vellus hair to terminal hair of the affected area is diagnostic of pattern hair loss (M-AGA and FPHL). The normal values of the T:V ratio on the non-alopecia scalp are approximately 2/1 to 7/1 [14].