The distinction between yang and yin signs of sores and ulcers is mainly in the aspects of local manifestations, systemic symptoms and tongue and pulse. 1. Local manifestations: Yang evidence of sores and ulcers, the general onset of acute, the location of the disease is located in the skin and flesh, the color of red, red, burning skin, swelling, swelling limited, hard lumps, pain is strong, after the collapse of the pus thick, granulation, red, live and moist. Yin sores, generally slower onset, deep location, hair in the tendons and bones, skin color dark purple or skin color unchanged, skin temperature is not high or slightly high, the skin is often collapsed and sunken, the scope of the swelling is not limited, the lumps are as hard as a stone or as soft as cotton, the nature of the pain is mostly aching, pain or no pain, after the collapse of pus is thin or for the blood and water, the color of the granulation is pale or dark purple. 2. Systemic symptoms: Yang evidence of sores, the initial stage is often accompanied by fever, cold (body cold), thirst, do not want to eat, constipation, urination (urine volume is small, the color of dark yellow) and so on. Yin sores and ulcers usually have no obvious symptoms in the early stage, and in the pus-filled stage, there may be hot flashes, night sweats (sweating abnormally after going to sleep, but sweating stops after waking up), and emaciation. 3. Tongue and moss and pulse: Yang evidence sores, generally red tongue with yellow moss and pulse. Yin sores are generally pale tongue with little moss and insufficient pulse. From the point of view of disease duration and prognosis, the disease duration of yang evidence sores is shorter and the prognosis is better, while the disease duration of yin evidence sores is longer and the prognosis is worse. Note: If you have any discomfort, you should seek medical advice and treatment under doctor’s guidance to avoid delay.