Trichoscopy: How to Observe and Use

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  • INUI Shigeki
    S Inui Clinic Department of Dermatology, Osaka University, Graduate School of Medicine

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  • トリコスコピー：どう見る，どう使う
  • トリコスコピー : ドウ ミル,ドウ ツカウ

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<p>　When the diagnosis of hair loss diseases is not definitive, trichoscopy using dermoscopy is useful for confirmation. First, the clinical hair loss pattern should be defined. When round hair loss is observed, alopecia areata is most likely, and trichoscopic features, such as black dots, broken hairs, tapering hairs, yellow dots and short vellus hairs, should be checked. In the case of patterned hair loss of the frontal and vertex scalp, hair diameter diversity（>20%）should be confirmed. Band-like hair loss suggests ophiasis-type alopecia areata or frontal fibrosing alopecia, and diffuse hair loss suggests diffuse type alopecia areata, female pattern hair loss or telogen effluvium. Therefore, trichoscopy findings support each diagnosis.</p><p>（日本皮膚免疫アレルギー学会雑誌, 3（2）：294-298, 2020）</p>

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