双侧对称分布是某些疾病的特征，如疱疹样皮炎、白癜风、银屑病。
1·Dermatitis herpetiformis (Duhring's disease) presents with intense pruritus and a vesicular eruption. It is associated with a usually asymptomatic gluten-sensitive enteropathy.
疱疹样皮炎（Duhring病）表现为剧烈瘙痒和水疱，常与无症状的谷胶敏感性肠病有关。