Urticaria is usually triggered by allergens, such as drugs, foods, insect <span style = 'background-color: #dae8f4'>bite</span>s
, inhaled substances, in response to sunlight, cold, heat, stress, exercise, or a viral infection. Other common allergens are pollen, mold, dust, pet dander, detergents, soaps, oils or cosmetics.
You can take non-sedating antihistamines such as cetirizine
or Loratadine(Claritin) when the rash appears.