Itchy red bumps in summer may be related to insect bite dermatitis, or may be caused by prickly heat, hives and other reasons. 1. Insect bite dermatitis: Since there are more mosquitoes in summer, if you are bitten by mosquitoes and trigger insect bite dermatitis, it will lead to itchy red bumps on your body. 2. prickly heat: in the hot summer, if you stay in the hot environment for a long time, resulting in more sweating, if the sweat is not discharged in a timely manner, it is easy to cause localized skin prickly heat, resulting in itchy red bumps on the body, can be accompanied by localized skin blisters with the size of the tip of a needle. 3. hives: the disease belongs to the allergic skin diseases, common in allergic body, especially in the hot summer, if the local skin contact with pollen, animal hair, dust mites and other substances, easy to cause an allergic reaction, triggering hives, resulting in itchy red bumps on the body. Itchy red bumps in the summer may also have other causes, should seek medical attention as soon as possible, after clarifying the cause of the disease, by the doctor’s guidance for treatment.