Small red spots on the body and particularly itchy, consider mosquito bites, contact dermatitis, eczema and other causes. 1. Mosquito bites: After being bitten by mosquitoes, there will be venom inside the skin, which will cause an allergic reaction, small red spots and itchy symptoms. 2. Contact dermatitis: this disease is contact with some irritating substances or allergic substances, skin mucous membrane acute or chronic inflammation, inflammation stimulation will lead to small red dots on the body, and there will be severe itching. 3. Eczema: the cause and mechanism of eczema is not particularly clear, caused by a variety of internal and external factors, manifested as chronic skin inflammation, rash and itching, such as corn size papules, papules and blisters, accompanied by intense itching. Small red spots on the body and particularly itchy may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.