肚子上白一块黑一块怎么回事

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病情分析：肚子上白一块黑一块一般是由色素沉着、内分泌失调等因素导致。色素沉着是由于新陈代谢功能减弱、皮肤干燥、长时间暴晒在紫外线下等因素所引起，患者皮肤表面会出现黑色的沉淀物。内分泌失调可能是季节变化、昼夜更替、睡眠、饮食等因素导致，可能会造成患者出现白发早衰、脾气暴躁、肌肤恶化，皱纹增多等症状。

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