Slow wound healing may be caused by nutritional deficiencies, age factors, and own diseases. 1. Nutritional deficiencies: severe protein deficiency can cause poor and slow regeneration of tissue cells, often leading to impaired growth of wound tissue cells, poor granulation tissue formation, fibroblasts can not mature, and collagen fiber synthesis is reduced. It also affects its transformation into fibroblasts, resulting in less scar formation, and reduced systemic and local zinc content leading to slow wound healing. 2. Age factor: the regeneration ability of tissue cells is different at different ages, generally the regeneration ability of tissues decreases with age, in addition, the elderly are prone to sclerosis due to blood vessels so that the local vascular supply is reduced, resulting in a decline in the quality of wound healing. 3. Autoimmune diseases: If the patient has diabetes, anemia, rheumatoid arthritis, autoimmune diseases, malignant tumors, liver failure and renal insufficiency and other systemic diseases, it will lead to slow wound healing. It is recommended that patients keep the wound dry, avoid water, recent diet should be light, avoid spicy food, timely consultation, under the guidance of a professional physician to identify the cause of the disease, and standardized treatment.