There are many reasons for red bumps on the body that itch in hot weather, and measures can be taken according to the specific cause. In general, the first consideration is that the heat causes a lot of sweat not to evaporate easily, thus appearing prickly heat, or due to the hot, dry environment leading to eczema, etc. If the symptoms are mild, local treatment is usually carried out, and when the situation is heavy, systemic treatment is combined: a. Local treatment: If the infection is combined with scratching, topical antibiotic ointment can be used, such as erythromycin ointment, fusidic acid cream, etc. 1. prickly heat: topical prickly heat powder, furnace glycolate lotion can be used to relieve. The itch is obvious that you can use topical glucocorticoid creams, such as dinaide cream, fluoxetine ointment, compound dexamethasone ointment, etc.; 2, eczema: available solution wet compresses, such as boric acid solution, and the combination of the above glucocorticoid creams; 3, mosquito bites: usually relieved by itself, can also be used topically containing mint, aloe vera, ice cream, or the use of ointments containing Chinese herbal ingredients, such as dampicol ointment, Qingpeng Ointment, etc. to relieve itching. Second, systemic treatment: usually, can use antihistamine drugs, such as loratadine, paracetamol, ketotifen, cetirizine, etc. can play an anti-sensitive, anti-inflammatory role. If the lesion area is too large can be given a small amount of corticosteroids, such as methylprednisolone, dexamethasone. If the combined infection can be used antibiotics, such as roxithromycin, amoxicillin, azithromycin, etc.. In addition, contact dermatitis, papular urticaria, polymorphic heliotrope and other skin diseases may also lead to red bumps followed by itching in the heat. Usually the above-mentioned ways can be taken to relieve the situation, if the situation is gradually serious, it is recommended to go to the hospital for timely targeted diagnosis and treatment.