JOURNAL ARTICLE

Trichoscopy for common hair loss diseases: algorithmic method for diagnosis

Shigeki Inui
Journal of Dermatology 2011, 38 (1): 71-5
21175759
In recent years, the usefulness of trichoscopy (scalp dermoscopy) has been reported for hair loss diseases. Here, characteristic trichoscopic features of common hair loss diseases are described using a DermLite II pro or Epilight eight. Characteristic trichoscopic features of alopecia areata are black dots, tapering hairs (exclamation mark hairs), broken hairs, yellow dots and short vellus hairs. In androgenetic alopecia (AGA), hair diameter diversity (HDD), perifollicular pigmentation/peripilar sign and yellow dots are trichoscopically observed. In all cases of AGA and female AGA, HDD more than 20%, which corresponds to vellus transformation, can be seen. In cicatricial alopecia (CA), the loss of orifices, a hallmark of CA, and the associated changes including perifollicular erythema or scale and hair tufting were observed. Finally, an algorithmic method for trichoscopic diagnosing is proposed.

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