There are many clinical causes of skin ulcers, mainly the following: 1, bedsores, diabetes, skin infection ulcers caused by varicose veins in the lower limbs, etc. If the patient is paraplegic or bedridden for a long time and cannot walk on the ground, long-term supine position will lead to lower limb vein compression, local blood circulation is blocked, the skin fails to get effective nutrient support, and skin ulceration will occur over a long period of time. 2, when the patient has poor blood sugar control or a long-term history of diabetes, when there is a rupture in other parts of the body, the skin will ulcerate when the inflammation is infected and does not heal over time. 3, when suffering from varicose veins of the lower extremities due to the blood flow in both lower extremities, the skin infection will ulcerate. When suffering from varicose veins in the lower extremities, due to the obstruction of blood flow back to the veins of both lower extremities, long-term stagnation, can not bring oxygen and nutrients in time, but also failed to take away waste products in time, long-term stagnation can easily lead to ulceration of the skin.