The itchy body with red spots may be due to allergies caused by dermatitis, eczema, may also be mosquito bites caused by papular urticaria or scabies, it is recommended to first need to clarify the cause. The general dermatitis, eczema manifestation for the sheet distribution of erythema, the surface with small papules, treatment can be topical glucocorticoids, at the same time serious people can take oral antihistamine loratadine, cetirizine, etc., avoid contact with suspected allergens, avoid hot and cold stimulation, wear cotton products for intimate clothing. If the papular urticaria is caused by mosquito bites, you need to avoid outdoor activities where there are many flowers and trees, and you need to dry your bedding regularly, and you can give topical dandruff ointment for topical use. Scabies is caused by scabies infection, usually occurs in the thin and tender parts of the skin, itching at night, and can be treated with sulfur ointment.