What should you know about seasonal hives?

Hives are raised, itchy areas that can appear suddenly and change shape or location. Heat, sweating, cold air, sunlight, pressure from clothing, pollen, infections, medicines, or foods may act as triggers. A single welt often fades while new ones appear elsewhere. Seasonal timing can suggest an exposure, but it does not prove the trigger.

Deeper swelling of the lips, eyelids, tongue, hands, or feet is called angioedema and may occur with hives or separately. A rash that stays fixed in one place, bruises, blisters, or burns deserves a different assessment.

Keep the skin cool, wear loose clothing, and avoid known triggers when practical. Record foods, medicines, activities, temperature, pressure, and timing around each flare. An oral antihistamine may be recommended by a clinician or pharmacist, with the choice guided by age, pregnancy, other medicines, and health conditions. Avoid adding several products without checking their ingredients.

Do not scratch or apply harsh fragranced products to the welts. If episodes recur, bring photographs to a consultation because the skin may look normal between flares.

Call emergency services immediately for trouble breathing, wheezing, throat tightness, difficulty swallowing, voice change, dizziness, collapse, or swelling of the tongue. Seek prompt medical advice for rapidly worsening facial swelling, repeated attacks, or hives that persist and interfere with sleep or daily activity. A fixed painful or bruising rash also needs review.

Ask whether the pattern fits hives or angioedema, which triggers are worth tracking, which antihistamine plan is suitable, and what emergency action to take if swelling or breathing symptoms develop.