The absence of hair can be due to genetics, prior electrolysis or laser hair removal, over-plucking, thyroid or other hormonal abnormalities, or trauma due to surgery, burns or other types of accidents.
The donor hair come from the back of the scalp, where the healthiest hair are found. When the hair is transplanted into the eyebrows, they will continue to grow for a lifetime. Therefore, they will need to be trimmed about once a month. To provide a natural appearance, one or two hair are transplanted at a time while preserving the direction of the natural eyebrow hair growth. This is a very delicate procedure, requiring perfect placement of these hairs.
A procedure typically involves the placement of 50-325 hairs into each eyebrow, depending upon the existing amount of hair and the desired size and density. Performed under local anesthesia the procedure is essentially painless, as is the recovery period.
For the first two to four days after the procedure, tiny crusts form around each transplanted hair. By three to five days, other than some occasional mild pinkness which fades out by the first week, patients are able to return to normal activities without any sign of having had a procedure. The transplanted hairs fall out at around two weeks, then start to regrow at three months. After the 3 month period, they will continue to grow for a lifetime.