A: Hair transplants, whether using the strip method to harvest the donor hair or by extracting individual follicular units one-by-one directly from the scalp, will leave some scarring. If the hair is long enough so that the underlying scalp is not visible, these scars will not be seen.

The quality and density of a person’s donor hair will affect this coverage and determine how short a person may keep his hair. In some cases the back and sides can be cut to a few millimeters, in others it would need to be kept longer. Since there is no scarring in the recipient area (the front and top of the scalp where the grafts are placed) the hair in these areas may be kept at any length.

A: Normally, the donor area contains hairs of very uniform diameter (called terminal hairs). In androgenetic hair loss, the action of DHT causes some of these terminal hairs to decrease in diameter and in length until they eventually disappear (a process referred to as “miniaturization”). These changes are seen initially as thinning and eventually lead to complete baldness in the involved areas.

These changes affect the areas that normally bald in genetic hair loss, namely the front and top of the scalp and the crown. However, miniaturization can also affect the donor or permanent regions of the scalp (where the hair is taken from during a hair transplant). If the donor area shows thinning, particularly when a person is young, then a hair transplant will not be successful because the transplanted hair would continue to thin in the new area and eventually disappear. It is important to realize that just because hair is transplanted to another area, that doesn’t make it permanent – it must have been permanent in the area of the scalp it initially came from.

Unfortunately, in its early stages, miniaturization cannot be seen with the naked eye. To detect early miniaturization a doctor must use a densitometer, or an equivalent instrument, that magnifies the surface of the scalp at least 20-30 times. This enables the doctor to see early changes in the diameter of the hairs that are characteristic of miniaturization. If hairs of varying diameter are noted (besides the very fine vellous hairs that normally occur in the scalp), it means that the hair is being affected by DHT and the donor area is not truly permanent.

In this situation, a person should not be scheduled for hair transplantation. If the densitometry reading is not clear, i.e. the changes are subtle and the doctor is not sure, then the decision to have surgery should be postponed. By waiting a few years, it will be easier to tell if the donor area is stable. Having surgery when the donor area is miniaturizing can be a major problem for a patient, since not only will the transplanted hair eventually disappear, but the scar(s) in the donor may eventually become visible. This problem will occur with both follicular unit transplantation (FUT) and follicular unit extraction (FUE).

A: A trichophytic closure is a way to minimize the appearance of the donor scar in a hair transplant using a strip incision.

The technique entails cutting the off the top of one of the wound edges and suturing it so that the hair from that edge grows through the scar. Either wound edge can be trimmed in the technique, but removing part of the upper edge is most common.

A: It is a very common practice to make a second separate scar in the second hair restoration procedure. This is done to maximize the hair in the second session, and it is technically the easiest to perform. If you incorporate the old scar in the new incision, there will obviously be less hair. As long as the upper incision is still in the permanent zone, the hair quality will be good.

That said, in my practice I almost always use only one scar. The subsequent procedure would incorporate the first and extend the scar to one side or the other (or both). I generally use the old scar as one edge of the new strip so that there is only one incision into virgin scalp (rather than two).

There are a number of reasons for this technique.

1. The hair will always be taken from the mid-portion of the permanent zone, so we utilize the thickest, most stable hair
2. A line scar in this location is generally the least visible and most easily camouflaged with the persons existing hair
3. One avoids making a scar too low that increases the risk of widening the scar
4. One scar will be easier to camouflage with Follicular Unit Extraction (if this is ever necessary)