A 31-year-old female presented with a 2-3 day history of pruritic symmetric erythematous papules on both axillas, popliteal fossa, buttocks and groins.

• 患者女，31岁，因右侧腋下红斑、丘疹伴瘙痒3天，左侧腋窝、双侧腹股沟、腘窝和臀部对称性红斑、丘疹伴瘙痒2天来就诊。