这个词是什么意思？
Excessive pigmentation of the skin, usually as a result of increased epidermal or dermal melanin pigmentation, hypermelanosis. Hyperpigmentation can be localized or generalized. The condition may arise from exposure to light, chemicals or other substances, or from a primary metabolic imbalance.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D017495 · MeSH 2026。
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