单个皮损为风团 多个皮损为风团或荨麻疹
风团：局限性暂时性扁平的表皮下水肿，伴周围红斑
血管性水肿：真皮深部局限性水肿，边界模糊，实性，但为可压缩性肿胀
荨麻疹：通常伴明显的瘙痒
血管性水肿：压迫感
荨麻疹：可累及任何部位，尤其是躯干和四肢，面部和头皮少见
血管性水肿：好发于面颊、眼睑、唇部、口腔和外阴黏膜
暂时性，皮损可持续数分钟至数小时
伴斑片、红斑和潮红
消退完全不留瘢痕和其他改变
虽然荨麻疹可持续数天至数周，但是单个风团从不超过24小时
通常伴剧烈瘙痒
多种原因：物理性因素、感染、过敏反应、药物
血管性水肿：真皮下部的深在性水肿（苍白、实性肿胀）
荨麻疹
血管性水肿
肥大细胞、嗜碱细胞；组胺和其他炎性介质（前列腺素、白三烯）释放
组胺的三联反应：瘙痒、红色斑片、风团
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