The rash of urticaria is characterized by a large, edematous erythematous rash, which may appear and disappear at times, and is indefinite, fading without a trace, usually within 24 hours, and is accompanied by itching. Scratching can be followed by a positive skin scar, which is a strip of edematous erythema that appears 1-3 seconds after scratching. Urticaria can be treated with antihistamines, such as oral Zocetilide hydrochloride capsules, loratadine hydrochloride tablets, chlorpheniramine maleate tablets, loratadine capsules, desloratadine capsules or loratadine citrate capsules, topical glycopyrrolate lotion, and oral glycopyrrolate preparations, such as compound glycopyrrolate capsules three times a day, three capsules a time, and avoid a spicy and irritating diet.