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There are four primary different types of hair replacement methods, including the following:
Hair transplantation - During hair transplantation, the surgeon removes small pieces of hair-bearing scalp grafts from the back or sides of the head. These grafts are then relocated to a bald or thinning area.
Tissue expansion - In this procedure, a device called a tissue expander is placed underneath a hair-bearing area that is located next to a bald area. After several weeks, the tissue expander causes the skin to grow new skin cells. Another operation is then required to place the newly expanded skin over the adjacent bald spot.
Flap surgery - Flap surgery is ideal for covering large balding areas. During this procedure a portion of the bald area is removed and a flap of the hair-bearing skin is placed on to the bald area while still attached at one end to its original blood supply.
Scalp reduction - Scalp reduction is done in order to cover the bald areas at the top and back of the head. This technique involves the removal of the bald scalp with sections of the hair-bearing scalp pulled together filling in the bald area.