A 34-year-old woman presented with a 3-year history of changes in skin color. Examination was notable for hypopigmented macules on a background of hyperpigmentation, creating a raindrop-like appearance on the chest and back. Neighbors who drank water from the same well had similar skin changes. What is the most likely diagnosis?
A. Arsenic toxicity
B. Cadmium toxicity
C. Copper toxicity
D. Lead toxicity
E. Mercury toxicity
答案解析：
实验室测试显示，患者的指甲和头发以及井水中的砷含量升高。 建议患者寻找替代水源，并密封受污染的水井。 在 3 个月的随访中，她的皮肤变化有所减轻。
正确答案：A
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