这个词是什么意思？
A vascular reaction of the skin characterized by erythema and wheal formation due to localized increase of vascular permeability. The causative mechanism may be allergy, infection, or stress.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014581 · MeSH 2026。
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