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The biopsy of the skin lesion of right forearm. (A-B) Hematoxylin and eosin-stained staining of skin biopsy. The biopsy of the skin lesion showed local keratinocytic necrosis (A) and subepidermal split (B). (C) PD-1 expression in skin lesion. (D) PD-L1 expression in the basal layer of the skin. (E) PD-L1 expression in the glands of the skin. (F) CD4+ T lymphocyte infiltration in the skin. (G) CD8+ T lymphocyte infiltration in the skin.
