Fig. 1

Physical examination and pathological findings of a follicular biopsy. a Alopecia areata on the head was observed to be progressing preoperatively, and hair loss was observed on the entire head. b Longitudinal section of the hair follicle (HE stained × 10). An inflammatory cellular infiltration of neutrophils, lymphocytes, and plasma cells can be seen from the hair follicle to the surrounding tissue. c Immunohistochemical staining was performed (CD8 immunohistochemical stained × 10). CD8-positive T lymphocytes were observed around the hair follicle