Itchy red dots on the body may be related to insect bite dermatitis, eczema and contact dermatitis. 1. Insect bite dermatitis: If mosquito bites in the summer, mosquito saliva can cause the body to undergo an immune response, triggering an allergic reaction at the bite site, red bumps with itchy phenomenon can occur. 2. Eczema: caused by a variety of internal and external factors in the superficial dermis and epidermal inflammation, can lead to long red pimples and itchy. 3. Contact dermatitis: mainly due to contact with certain allergy-prone substances appear localized red spots or erythema, the color can be light red or bright red, and accompanied by itching. It is recommended that people with red dots and itchy skin go to a regular hospital in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.