Urticaria or hives is a skin disease that appears on the skin as a manifestation of hive-like changes. Sometimes, along with hives on the skin, angioedema or swelling in the area of the eyelids, oral mucosa.... We distinguish between acute and chronic urticaria. In acute urticaria, hives on the skin appear for up to 6 weeks, in chronic, they last longer. Most often, the cause of urticaria are infections, allergies etc. Urticaria is treated with antihistamines.