Itchy skin and red bumps may be the following diseases: 1, urticaria, the rash of the disease can subside within 24 hours, you can apply topical glycolic lotion, oral second-generation non-sedating antihistamines, such as levocetirizine, loratadine, cetirizine, epalrestine, azulfiram, fexofenadine, chlorpheniramine, etc. 2, eczema, the rash is polymorphic changes, recurrent, vesicles, oozing obvious When there is no obvious exudate and vesicles, glucocorticoid preparations can be applied topically, such as dexamethasone acetate cream, hydrocortisone cream, tretinoin econazole cream, dinaide cream, halometasone cream, fluticasone propionate cream, etc. 3, insect bite dermatitis, manifesting as fusiform, windbag-like papules with small blisters in the center, some of which may have pseudopods, can be applied topically with glucocorticoid preparations, such as tretinoin The topical glucocorticoid preparations, such as trimethoprim, dexamethasone acetate cream, dextran cream and hydrocortisone butyrate cream, can be used.