Red dots on the back of the feet do not hurt or itch, usually due to hemangioma, allergic purpura and other reasons, different causes, different treatment methods. 1. Hemangioma: mainly caused by abnormal development of blood vessels, one or more small red dots will appear on the affected area at the initial stage, and red plaques will gradually bulge in the later stage, which can occur in any part of the body without itching and pain, and can be treated by laser. 2.Allergic purpura: mostly caused by bacterial infections, external stimuli or immune disorders, occurring in the face, trunk and lower limbs, red dots and purplish-red papules will appear in the affected area, without pain, according to the condition of prednisolone, cetirizine hydrochloride tablets and other drugs for treatment. However, other factors can not be ruled out, it is recommended that the patient consult a doctor in a timely manner and be given targeted treatment by the doctor.