Legs and arms grow a lot of bags especially itchy may be mainly due to contact dermatitis, eczema, hives and other causes, generally can be treated through general treatment and drug therapy and other ways to treat. 1. General treatment: reduce external stimuli, avoid hot water scalding and violent scratching of the affected area, avoid contact with possible allergens, such as dust, pollen, animal hair. You should also avoid eating irritating and allergy-prone foods, such as shrimp, crab, mango, strong tea, alcohol, coffee and so on. 2. Medications: allergies can be caused by the use of loratadine, cetirizine hydrochloride and other drugs; eczema can be caused by the use of dieldrin cream or compound glycyrrhizic acid glycoside tablets and other medications; hives can be used by the use of ibogaine, avastin and other drugs to treat. Patients should go to the hospital in time, the doctor to clarify the cause of the disease for targeted treatment.