There are many reasons why there are small red blood spots on the body, mainly the following common diseases: First, capillary hemangioma, also known as cherry angioma, there are grains of rice to mung bean grains of small red dots, and continue to increase in the older middle-aged and elderly people, due to skin aging caused by the human body after aging skin can not control the proliferation of small blood vessels, small blood vessels slowly grow into a line of red dots, do not need treatment, do not affect the health. The first thing you need to do is to get a good deal of money to pay for it. Secondly, allergic purpura is a common allergic vasculitis, clinical manifestations of red spots on the skin, manifested in the limbs, especially the buttocks are the most common, allergic purpura caused by many reasons, and the infection of the immune system to reduce the relevant, symptomatic treatment, pay attention to rest, test the patient’s renal function can be.