The main reasons for the small red dots on the legs are as follows. 1, red dots mainly in the calf area, higher than the normal skin, pressed by hand does not fade, no pain, no itch, consider allergic purpura, to the hospital laboratory tests routine blood, blood sedimentation to see the number of platelets and white blood cells to confirm the diagnosis. According to the patient’s clinical symptoms choose rutin, pansentin, atropine and other drugs to improve vascular permeability, anti-platelet agglutination, relieve spasm treatment. 2, in the root of the thighs appear dense pinpoint or rice grain size small red dots, and itching, consider jock itch, these patients usually affected area sweating more, long-term damp state led to a large number of fungal breeding and the formation of this disease, with clotrimazole ointment, yellow skin ointment rubbing the affected area, diligent bathing, diligent change of clothes, keep the skin clean and dry. 3, legs after contact with something appear small red dots, serious itching is caused by allergies The skin is treated with oral cetirizine, paracetamol and other anti-allergic drugs, away from allergens.