Depressed scars are clinically referred to as depressed scars. Commonly used repair modalities include laser treatment, microneedling, and filler treatment, all of which have certain efficacy. Patients can promptly consult the dermatology department, combine the lesions, and the doctor will evaluate and choose the appropriate repair modality. 1. laser treatment: commonly used ultra-pulsed carbon dioxide fractional laser treatment, by punching tiny holes in the scars, causing a biochemical skin reaction, stimulating collagen fiber proliferation at the base, chipping the edges of the scars and making them flat; 2. microneedle treatment: refers to the repair modality by destroying collagen bundles in the superficial dermis It is also called transdermal collagen induction therapy, which is a simpler and safer treatment and has faster recovery after surgery; 3.Filler treatment: including autologous fat and hyaluronic acid filling. Autologous fat filling can reduce the rejection and immune reaction of the body, and natural hyaluronic acid can help improve cell proliferation and extracellular matrix synthesis, regulate collagen fibers, and promote the recovery of depressed scars; 4. Other treatments: including chemical peeling, subcutaneous minimally invasive surgery, radiofrequency therapy, stem cell technology, and platelet-rich plasma technology, etc., which can also play a role in repairing depressed scars. In addition, drugs such as fruit acids, silicone gel, compound heparin sodium allantoin gel, etc. can be applied at the early stage of scar formation, but they may not be effective in the treatment of some depressed scars, and it is still controversial for the determination of efficacy, and patients should consult their doctors before using the drugs.