PMC9874476_01
(a) Patchy hair loss on the scalp after COVID-19 infection. (b) Dermoscopic observations revealing yellow dots (yellow arrow) and a black dot (blue arrow). (c) Flow cytometric analysis indicating a high frequency of IFN-gamma-producing T cells when compared to IL-4-producing T cells by the intracytoplasmic staining of the PBMCs. (d) Diffuse hair loss followed by alopecia areata. (e) Dermoscopic observations reveal the regrowth of vellus hair on the scalp.
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Three weeks after discharge, she experienced patchy hair loss on her head, and she was referred to our hospital 7 weeks after discharge (Figure 1a). Figure 1b). Flow cytometric analysis of peripheral blood mononuclear cells (PBMCs) showed a relatively high frequency of IFN-gamma-producing T cells (10.2%) when compared to IL-4-producing T cells (0.64%) by the intracytoplasmic staining of the PBMCs (Figure 1c). The patient also experienced significant hair shedding (more than 200 hairs/day) from the whole scalp skin shortly after the AA improved (13 weeks after the COVID-19 infection; Figure 1d). Dermoscopic observation revealed many vellus hairs on the scalp skin (Figure 1e).