Dermographism is seen in urticaria, if we scratch the skin of the patient with key or any metallic substance, histamines are released, ... ... <看更多>

Darier's sign 指的是肥大細胞瘤釋放出肝素、組織胺與胜肽酶造成周圍組織微血管的通透性增加，進而產生水腫、紅斑甚至出血的表徵。 ... <看更多>