The journal of allergy and clinical immunology. In practice 2018 Jul-Aug
How to Approach Chronic Inducible Urticaria.   
ABSTRACT
Chronic inducible urticaria (CIndU) is a group of chronic urticarias characterized by the appearance of recurrent wheals, recurrent angioedema or both, as a response to specific triggers. CIndU includes both physical (symptomatic dermographism, cold and heat urticaria, delayed pressure urticaria, solar urticaria, and vibratory urticaria) and nonphysical urticarias (cholinergic urticaria, contact and aquagenic urticaria). Here, we review the different forms of CIndU with an emphasis on symptomatic dermographism, cold urticaria, cholinergic urticaria, and delayed pressure urticaria. We discuss the clinical features, the diagnostic workup including provocation and threshold testing, and available treatment options.

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Female in her early 40s with chronic spontaneous urticaria occurring consistently only at night for the past 4 years. Lesions develop only at night wh...