Blood-colored red dots on the body may be allergic purpura, progressive pigmented purpuric dermatosis, cherry-like hemangioma, and so on. 1. Henochromatosis purpura: it is a kind of allergic reaction disease of small blood vessels of the whole body, manifested as pinpoint to soybean size dark red petechiae ecchymosis, mostly seen in the lower limbs of both sides, and it occurs in children and adolescents. 2. Progressive pigmented purpura dermatosis: purpura dermatosis caused by erythrocyte spillage, prevalent in both lower limbs, manifested as clusters of pinpoint-sized red petechiae, prevalent in middle-aged people. 3. Cherry-like hemangioma: also known as senile hemangioma, prevalent in the trunk, red hemispherical elevated papules, nodules, diameter of 3~5mm, with the increase of age and increase. There may be other reasons for the blood-colored red dots on the body, it is recommended to go to the regular hospital, diagnosed by a professional physician and guided by the treatment.