Red blood spots under the skin of the finger may be related to cutaneous hemangioma, purpura simplex, trauma and other diseases, which can usually be treated with medication and laser therapy. 1. Cutaneous hemangioma: cutaneous hemangioma belongs to a kind of benign tumor of vascular malformation, which is relatively small at the beginning, usually manifested as small red blood spots under the skin of the finger, but with the progression of the disease, the area will be expanded gradually, and it will also protrude from the epidermis. Generally, it can be treated by the method of laser, using the photothermal effect of laser, which can promote the shrinkage and subsidence of skin hemangioma. 2. Purpura simplex: the onset of young women, often associated with the menstrual cycle, often occurring in the limbs, the trunk is rare. The main manifestation is purpura or ecchymosis of the skin after minor trauma or spontaneous appearance, the lesion is confined to the skin to avoid the use of non-steroidal anti-inflammatory drugs in the treatment, and if necessary, can take vitamin C, rutin and carbachol (Anluo blood) and so on. 3. Small blood spots may also appear when the finger area is stimulated by external pressure, resulting in rupture of capillaries under the skin and accumulation of blood under the skin. If the trauma does not cause other discomfort, no special treatment is needed. There are other causes of red blood spots under the skin of the fingers (such as insect bite dermatitis), and it is recommended that the patient go to the hospital in time to find out the cause of the disease, and then carry out standardized treatment, so as not to delay the condition.