|
| Fig. 23.2 Dermographism: Whealing immediately following pressure. |
Of 554 patients with urticaria seen in a university clinic in England, physical urticarias constituted 17.5% of the total; most of the remainder were idiopathic. The most frequent of the physical urticarias were dermographism (8.5%) (Fig. 23-2), cholinergic urticaria (5.1%), and acquired cold urticaria (2.5%).
