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. 2022 Oct 8;23(19):11956. doi: 10.3390/ijms231911956

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© 2022 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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Scalp hair follicles in alopecia areata. (a) A representative semithin section shows: a follicular papilla (dp) with abundant flocculent substance; a hair matrix (mx) with many cells not well organized; cts: connective tissue sheath. (b,c) The representative ultrastructural sections of hair matrix and follicular papilla respectively show: mx: hair matrix; a: apoptotic debris; thick arrows: beaded membrane of keratinocytes; dp: follicular papilla; head arrows: bacteria infiltrations; s: melanosome structures; l: lymphocytes; red square: area of inset magnification. (a) 200×; (b) 1750×; (c) 12,500×.