Figure 2.

Classification of urticaria: overview. *The 48-hour cut-off refers to individual lesions, while the 6-week cut-off refers to the condition as a whole.

Kanani et al. Allergy, Asthma & Clinical Immunology 2011 7(Suppl 1):S9   doi:10.1186/1710-1492-7-S1-S9