How many hairs can you transplant into a square centimeter? I have a scar, and I want to fill it in. I am trying to find a doctor who can fill it in with just one surgery. Is this a reasonable question?
An excellent question! The calculation is one that is used in the industry as a benchmark measurement. The average person with 100,000 hairs on his head has 1250 hairs per square inch or 193 hairs per square centimeter.
But what is the number to use in determining the correct density for a hair transplant? Some doctors use high density numbers to define how good they are. However, there is a balancing act between maximizing density at the time of a transplant surgery and maximizing growth months later. Experienced doctors are the key.
The reasonable upper limit of density numbers from a transplant perspective is up to 120 hairs per square cm. This type of density, however, requires supple skin that still has elastic properties. Scars do not have this characteristic. Also scars have an abnormal blood supply when compared with normal skin. Much of the infrastructure and microcirculation in the vasculature is not present in scar, so transplanting very high densities may not produce good growth.
You need to be examined by a hair transplant expert, who has the experience to give you a reasonable answer to your specific need. While I understand that you would like to have this completed in one surgery, that may not be in your best interest. Only your doctor will be able to advise you.