Urticaria is usually triggered by allergens, such as drugs, foods, insect bites, inhaled substances, in response
to sunlight, cold, heat, stress, exercise, or a viral infection. Other common allergens are
pollen, mold, dust, pet dander, or cosmetics. Since you experienced an itch, just go over these possibilities in your mind. Something may strike you. In many cases, hives clear up themselves and don’t require diagnosis or treatment.