Itchy red bumps on the upper limbs may be caused by mosquito bites or hives, you can rub some Halomethasone ointment or oral medication such as Loratadine for treatment. If mosquito bites lead to red bumps on the upper limbs and itchy, can be relieved by cold compresses, or external halomethasone ointment and other glucocorticoid drugs to stop itching treatment, should pay attention to the protection. If it is caused by urticaria, usually appear red spots, wind masses with itching, first of all, we must stay away from allergens, to avoid further allergic reactions, you can take oral loratadine and other anti-allergy drugs for treatment. It is worth noting that it is important to avoid scratching the itchy area, so as not to cause further damage to the affected area. If the itching is more serious, you should go to the dermatology department in time and take medication under the guidance of the doctor.