Itchy red bumps on legs are considered to be hives, contact dermatitis, eczema and other diseases, mainly medication, physical therapy and so on. 1. urticaria: this is a kind of allergen or other factors caused by a variety of inflammatory cell activation, and release some chemical mediators, such as histamine, which causes itching, red or pale white wind, you can take oral antihistamine drugs, such as cetirizine, loratadine. 2. Contact dermatitis: localized skin lesions will appear after local contact with certain irritating substances, such as pimples, papules and blisters, which can be treated with glucocorticosteroid medications such as dexamethasone cream and triamcinolone acetonide cream, and when itching is severe, oral cetirizine and ibastine can be taken. 3. Eczema: in the early stage of the disease, there are usually erythema, and on the basis of erythema, there are small pimples and papules of the size of corn grains. Hasinide cream, mometasone furoate cream can be applied. It can also be treated with a combination of antihistamines such as chlorpheniramine and ebastine. Itchy red bumps on the legs may also be other causes, it is recommended to go to the hospital, by the doctor to clarify the cause after standardized treatment, all of the above drugs should be used in accordance with medical advice.