I have read some doctors preaching the use of chest and leg hair for hair transplants. I have also read your comments and general lack of enthusiasm for this. What is behind your strong opinions against this?
Scalp hair is better understood and tested for over 50 years. Although the art form has only been reasonable for the past decade or so, the facts concerning hair growth from a scalp source as donor hair are well understood. It is always important for me to inform patients about their risks, expected growth rate, and reasonable results that they should target. We have no body of evidence that hair taken from body or leg parts will work to any reasonable degree, but there seems to be (as P.T. Barnum said) a sucker born every minute. I do not want to be part of such a process, at least until it is clarified as something real.
In the book by Elise A. Olsen, Disorders of Hair Growth, the rest cycles of hair are stated. Although I can not attest for the science of these figures, let’s take them at face value for a moment and see what it means if correct. All hair cycles go through various growth phases, so the length of these growth phases are critically important to understand. For head hair, growth cycles range from 2-7 years, with a sleep period of 3-6 months. Generally it is believed that head/scalp hair is in its resting phase for about 10% of the hair population, which means that of all hairs growing on the head, another 10% is lying dorment awaiting its growth phase.
- Leg hair has a cycle between 7-12 months, but between 62-88% of these hairs are in their dormant phase.
- Thigh hair has a cycle of 3-5 months, but between 64-83% of these hairs are in their dormant phase.
- Arm hair have a cycle of 3-7 months, but between 72-86% of these hairs are in their dormant phase.
With chest, arm, and body hair, the above numbers suggest that there is a large number of sleeping follicles at any one time. If this is true, then there will be questionable value from a hair transplant using these body parts from fullness or coverage point of view. Add to that the pain of hundreds or thousands of small wounds created all over your body might produce. I wonder about the doctors who are routinely performing this type of surgery and ask about their motives. I have concluded that any doctor who offers this must let his patient know that this is not a tested procedure, falling in the experimental rather than the clinical hair transplant offerings. I’d also hope they reveal the figures related to sleep cycle of the hairs from the various body parts as discussed above so that their patients are well informed.
