Histopathology of scarring alopecia under immune checkpoint blockade. (a) Vertical sections of a scalp punch biopsy of case 2 show dense lichenoid interface dermatitis around the infundibulum and isthmus of the hair follicle (Haematoxylin and eosin (H&E) stain ×50). (b) The asterisk marks the lymphocytic infiltrate damaging the hair follicle epithelium (long arrow). Short arrow marks the perifollicular fibrosis (H&E stain ×200).

Histopathology of scarring alopecia under immune checkpoint blockade. (a) Vertical sections of a scalp punch biopsy of case 2 show dense lichenoid interface dermatitis around the infundibulum and isthmus of the hair follicle (Haematoxylin and eosin (H&E) stain ×50). (b) The asterisk marks the lymphocytic infiltrate damaging the hair follicle epithelium (long arrow). Short arrow marks the perifollicular fibrosis (H&E stain ×200).

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