Scalp scarring is caused by injury or surgery, most commonly hair transplants. Scarring is an inevitable by product of any hair transplant procedures. The two surgical procedures most often used for hair transplant are follicular unit extraction (FUE) and follicular unit transplantation (FUT). FUE is where hair follicles are extracted from the back and sides of the scalp. Each hair follicle will be removed individually with a micro-punch tool and the extraction will leave a tiny round scar, up to 1 millimeter in diameter. FUT is a procedure that requires the surgical removal of a strip of scalp that contains hair from the donor area (this is typically located on the back of the scalp). This procedure will leave a strip scar.