A man in his 60s presented to the dermatology clinic with a widespread, intermittently pruritic eruption. Examination showed coalescing annular, arcuate, and serpiginous red scaling plaques in a concentric pattern diffusely involving the chest, back, and abdomen with extension to proximal extremities (Figure,A and B). Punch biopsies from the chest(Figure, C and D) and back were obtained for histopathology and tissue culture. Treatment with topical corticosteroids under wet dressings was associated with partial improvement in the eruption and pruritus.

患者男性，60余岁，因广泛、间歇性瘙痒丘疹就诊皮肤科。检查显示融合性环状、弓形和匐行性红斑呈同心圆状，弥漫性累及胸部、背部和腹部，并延伸至四肢近端（图A和B）。从胸部（图C和D）和背部取钻孔活检标本，并进行组织病理学分析。湿敷下，局部皮质类固醇激素治疗，皮疹和瘙痒症部位改善。