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Dermatographism and urticaria in a pediatric population

Dermatographism is a transient linear cutaneous wheal produced after applying a force or scratching the skin. Wheals usually appear in about 5 to 10 minutes and persist for 15 to 30 minutes. Simple dermatographism must be differentiated from "symptomatic dermatographism" where patients suffer itching or a burning sensation together with the erythematous wheal [1,2]. Dermatographism is the most common expression of physical urticaria [3] with a prevalence estimated as 2-5% in the general population, with a higher prevalence in the paediatric population of about 24% [4].