The common causes of the bumps on the arms that itch more and more include urticaria, insect bite dermatitis, eczema, etc. It is necessary to clarify the cause of the disease and then choose the appropriate medication, such as antihistamines and glucocorticosteroids, etc., for treatment. 1. Urticaria: After the diagnosis of this disease, it is necessary to stay away from allergens or irritants, and use antihistamines for treatment, such as fexofenadine, avastin, etc.; if the condition is serious or accompanied by laryngeal edema, it is also necessary to use glucocorticosteroid treatment, such as prednisone. 2. Insect bite dermatitis: this disease can subside on its own, the treatment, external antipruritic drugs to relieve itching, such as glycerine lotion, zinc oxide ointment, etc.; symptoms are not relieved, can follow the doctor’s instructions to relieve the symptoms of topical glucocorticoids, such as hydrocortisone cream, etc.; itching is serious, but also oral antihistamine therapy, such as benzydamine, loratadine and so on. 3. Eczema: for localized exudate, boric acid solution, resorcinol solution and other medications can be used externally; no exudate, and then external glucocorticoids, such as halometasone cream, mometasone furoate ointment, etc., anti-inflammatory, symptomatic; itching is serious, oral antihistamine treatment, such as loratadine, cetirizine and so on. It is recommended that patients in the regular hospital after diagnosis, follow the doctor’s instructions reasonable medication, not blindly self-medication.