A previously healthy 42-year-old man presented with a 20-day history of an expanding, asymptomatic rash on his trunk. The initial lesion had been a red spot on the patient’s left side. Ten days after that spot had first appeared, smaller lesions had developed elsewhere. The patient reported no viral prodrome. The skin examination — including the initial lesion that had appeared — is shown. What is the diagnosis?
一位既往健康的42岁男性患者,因躯干上出现一个持续20天、逐渐扩大但无自觉症状的皮疹前来就诊。最初的皮损是患者左侧出现的一个红色斑点。在该红斑首次出现十天后,其他部位又出现了较小的皮疹。患者自述没有病毒感染的前驱症状(如发热、乏力等)。皮肤检查所见——包括最初出现的皮损——如图所示。诊断是什么?

A. Nummular eczema钱币状湿疹
B. Pityriasis rosea玫瑰糠疹
C. Secondary syphilis二期梅毒
D. Tinea corporis体癣
E. Tinea versicolor花斑癣(花斑糠疹)
答案解析:
根据患者在左腋中线处出现“先驱斑”(herald patch,即最初出现的单个较大斑疹)这一发现,诊断为玫瑰糠疹(pityriasis rosea)。玫瑰糠疹是一种自限性疾病,通常影响儿童、青少年和年轻成人。其病因目前尚不明确,可能与人类疱疹病毒6型或7型的再激活有关。
正确答案:B
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