A child with a bump on the forehead that scabs over and makes a dent will usually not heal on its own. This condition is generally known as depressed scarring. Depending on the condition, it can be treated with skin rubbing, surgery, or filling. The condition is generally known as depressed scarring, which is mainly formed after the healing of trauma to the skin, subcutaneous tissues or deep tissues, and can also involve deep tissues, resulting in adhesion to the base. Depressed scarring is usually not self-healing. The main feature is that the scar is significantly lower than the surrounding skin. If the scar is small and shallow, it can be improved by photoelectric treatment. If the scar is large and there is a deep tissue defect under the scar, it can be treated by skin rubbing, surgery, filling surgery and so on. It is recommended that patients who wish to undergo treatment go to a regular medical institution, and avoid spicy and irritating foods during the treatment period.