Scarring baldness is a variety of pathological processes caused by hair follicles are subjected to progressive irreversible damage, scar formation, resulting in hair loss, new hair can not be regenerated. Clinically, it is common that the scalp is defective due to burns, trauma, scalp avulsion, infection, surgery and other reasons, the hair follicles can not be regenerated, the formation of keloidal limited baldness permanent hair loss caused by burns, trauma and infection. As scarring baldness has obvious impact on appearance, it is easy to bring great trauma and pressure to patients mentally and psychologically. Therefore, whether from the functional or cosmetic point of view, scarring baldness should be restored in a timely manner. The purpose of restoration is to reuse the scalp with hair to cover the bald area and restore the natural beauty of a full head of hair. The treatment of scarring baldness is relatively complex and usually involves an individualized treatment plan for each condition. For small areas of permanent baldness, the scar can usually be repaired by direct excision and suturing, local flap transfer, or hair transplantation. For large areas of scarring baldness, a combination of soft tissue expanders and expanding flap transfers are often used to achieve good results. The cosmetic principle of the scalp expander is to generate and utilize “extra” scalp tissue. The expander is a capsule made of a silicone rubber membrane, and the most common type consists of a three-part expander, an injection pot and a catheter. The three parts are surgically implanted under the normal scalp near the scar, and after surgery, sterile isotonic saline is regularly injected into the injection pot, which flows down the catheter into the expansion capsule and gradually expands the expander. After a certain period of time, the scalp on the surface of the expanding capsule gradually stretches and expands, providing approximately 50% or more “extra” scalp tissue. In the second stage of the procedure, the expander is removed and the excess scalp on the surface of the expander is used to cover the scar tissue by local flap transfer to achieve plastic repair. The scalp that has been transferred through the tissue expansion technique has no difference in hair sparseness and hair growth direction from the normal scalp, so it is widely used in the clinic and the treatment effect is very ideal. Clinically, doctors need to formulate a personalized treatment plan according to the location and extent of the scalp defect. Most patients can achieve very satisfactory treatment results through the two phases of treatment mentioned above. If the scope of damage is larger, a second expansion can be performed to achieve complete healing results.