Description: Raised, itchy, red welts/wheals with clearly defined areas

Etiology: Allergic reaction to foods (fish, eggs, nuts, strawberries), drugs (ASA, codeine, penicillin, sulfa), & insect stings

Rx: Eliminate irritant; antihistamine; EpiPen under severe conditions

Source: From Barankin B & Freiman A (2006).