Skin always itchy red bumps may be related to mosquito bites, allergic dermatitis, hives and so on. 1. Mosquito bites: when the skin is bitten by mosquitoes, mosquito saliva injected into the bite site, it will be easy to stimulate the body’s immune system, causing the skin to itch, red bumps and other symptoms. 2. Allergic dermatitis: some patients are susceptible to allergies, if contact with animal fur, pollen, synthetic fibers and other allergens, may cause the body’s autoimmune response, the skin is always itchy red bumps. 3. Urticaria: Itchy skin with red bumps can also be caused by urticaria, due to the temporary increase in vascular permeability of the skin caused by limited edema, the appearance of the skin, red bumps, itching and other symptoms. When the patient always itchy skin with red bumps, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease and follow the doctor’s instructions for treatment.