A previously healthy 20-year-old man presented to the dermatology clinic with a 4-week history of an itchy rash on his upper chest and shoulders. Two months before presentation, he had started a carbohydrate-restricted ketogenic diet for weight loss. Physical examination is shown. Which of the following is the most likely diagnosis?一名既往健康的20岁男性因上胸部和肩部瘙痒性皮疹持续4周前来皮肤科门诊就诊。就诊前两个月，他开始采用低碳水化合物生酮饮食以减轻体重。体格检查如图所示。以下哪项是最可能的诊断？
A. Confluent and reticulated papillomatosis融合性和网状乳头瘤病
B. Contact dermatitis接触性皮炎
C. Erythema dyschromicum perstans持久性红斑色素沉着症
D. Prurigo pigmentosa色素性痒疹
E. Tinea corporis体癣
答案解析：
色素性痒疹（又称“生酮饮食皮疹”）是一种炎症性皮肤病，表现为胸部、背部或颈部出现瘙痒性红色丘疹，随时间推移可能发展为网状分布。该疾病与以下情况相关：生酮饮食（如本例患者）导致的酮症、糖尿病以及禁食状态。治疗包括使用四环素类药物及纠正酮症。
正确答案：D
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