The increasing number of small red dots on the body may be due to purpura, papular urticaria, eczema, cornified rash and other factors. 1. Purpura: common allergic purpura, thrombocytopenic purpura, manifested as a gradual increase in the number of bruises on the skin, petechiae, may also be accompanied by joint pain, abdominal pain, nosebleeds, bleeding gums, headaches and other symptoms. 2. Papular urticaria: also called “insect bite dermatitis”, is due to the mosquito, flea and other bites, manifested as the bite site, petechiae, papules, often accompanied by itching. 3. Eczema: the body is stimulated by internal and external factors may lead to the occurrence of eczema, can occur in any part of the body, manifested as red papules, accompanied by obvious itching, may also appear pimples, blisters and other symptoms. 4. Corn grain rash: also known as “prickly heat”, is a common inflammatory skin disease in hot environments, often occurring in the neck, armpits and other skin folds, manifested as a small papule surrounded by a reddish halo, itchy and prickly sensation. Small red dots on the body more and more may also be caused by other factors, it is recommended that patients seek medical attention in a timely manner to clarify the cause of the disease under the guidance of the doctor for symptomatic treatment.