What should you know about prescription for hives?

Hives are raised, itchy welts caused by skin reactions that release inflammatory chemicals. Individual welts can change shape or fade while new ones appear. [Itchy Skin](/symptoms/itchy-skin/) and [Skin Rash](/symptoms/skin-rash/) often accompany hives. Swelling deeper in the skin, especially around the lips or eyelids, is called [Angioedema](/conditions/angioedema/) and needs careful assessment.

Take an [Antihistamine Treatment](/treatments/medical-dermatology/oral-antihistamine-therapy/) exactly as prescribed and do not combine products without checking with a clinician or pharmacist. Avoid known triggers when one is identified, and keep a record of foods, medicines, infections, heat, pressure, or exercise that precede a flare. A clinician may sometimes use [Oral Corticosteroid Treatment](/treatments/medical-dermatology/oral-corticosteroid-therapy/) for a severe episode, but this is not suitable for every person.

Call emergency services immediately for swelling of the tongue or throat, trouble breathing, wheezing, faintness, or difficulty swallowing. Seek medical review for painful rather than itchy lesions, bruising, fever, or swelling that lasts in one spot. These features can suggest something other than straightforward hives.

Could a medicine, food, infection, or physical trigger be contributing? How long should I use the antihistamine? Which symptoms mean I should seek emergency help? Is a corticosteroid appropriate for my episode?