Red bumps on the hands are very itchy, consider eczema, papular urticaria, sweat blisters or scabies symptoms. You need to go to the dermatology department of the hospital in time, and use medication under the guidance of the doctor. 1. Eczema is often caused by a variety of factors inside and outside of the stimulus, manifested as the hands of symmetrical erythema, red papules, flaking, accompanied by varying degrees of itching. 2. Papular urticaria is an allergic reaction caused by insect bites on the skin, and patients often have been to the mountains, fields, grass and other places before the onset of the disease. The manifestation of scattered red bumps on the hands, bumps on the surface of red spots or pin-tail-sized blisters, itching is obvious. 3. Sweat herpes is a special type of eczema, may be related to local allergies, infections, essential factors, etc., manifested as the palms of the hands and fingers symmetrically appeared deep in the red bumps and subcutaneous blisters, itching is obvious, press the rash when there is a tingling sensation. 4. Scabies is caused by scabies infection, transmitted through skin contact. It manifests itself in the form of corn-sized pimples and blisters on the fingertips of both hands, armpits, groin and male scrotum, with itching at the rashes and intense itching at night. There may be other reasons for the itchy red bumps on hands, it is recommended to go to the hospital in time to find out the cause and treat the symptoms.