Depressed scar is called depressed scar in clinic. At present, the commonly used repair methods include laser therapy, microneedle therapy and filling therapy, all of which have certain curative effects. Patients can see dermatologists in time, and doctors can choose appropriate repair methods according to the evaluation of skin lesions.

1. laser therapy: ultra-pulse carbon dioxide lattice laser therapy is commonly used. By punching holes in the scar, the skin biochemical reaction is caused, which stimulates the proliferation of basal collagen fibers and makes the edge of the scar sharp and flat.

2. Micro-needle therapy: refers to the repair method of stimulating more collagen production by destroying the collagen bundle in the superficial dermis, also known as percutaneous collagen induction therapy, which is a relatively simple, safe and quick recovery after operation;

3. Filling therapy: including autologous fat and hyaluronic acid filling. Autologous fat filling can reduce the body's rejection and immune response. Natural hyaluronic acid is helpful to improve cell proliferation and synthesis of extracellular matrix, regulate collagen fibers and promote the recovery of concave scars.

4. Other treatments: including chemical exfoliation, subcutaneous minimally invasive surgery, radio frequency therapy, stem cell technology and platelet-rich plasma technology. It can also repair sunken scars.

In addition, drugs such as fruit acid, silica gel and compound heparin sodium allantoin gel can also be applied in the early stage of scar formation, but the therapeutic effect on some concave scars may not be obvious, and the judgment of curative effect is still controversial. Patients should consult a doctor before taking medicine.