Based on the fact that the average Caucasian male has a density of 2 hairs per millimeter, it can be assumed that the average density of hair is 1250 hairs per square inch. Figuring at an average of 2 hairs per follicular unit, it would take 625 follicular units per square inch. To get 25% of that, you would need 156 follicular units per square inch. Uncontrolled high blood pressure would be a problem. If you are on anti-clotting medications such as Coumadin, you would have to stop taking them for awhile before having a hair transplant. People who have a history of excessive scarring might want to think twice about getting a hair transplant. Scars are usually a part of the procedure because the donor hair is taken from the back and sides of the scalp. Discuss healing with your hair transplant surgeon. Because you may be having plugs removed, you have more healing to do than someone who is having a routine hair transplant. You need to let the plug sites heal as well as the new insertion sites and possible new donor sites. It may take special post-operative care and longer down-time. These cells would not be adequate for use with hair transplant surgery. There seem to be other cells which last longer and would work for this application. A scientist named Dr. Gho has done some work and acquired a Dutch patent on his work with hair multiplication. It is unclear whether this is much like hair cloning or not. It was agonizing for this group of young people because thinning, balding, and receding hairlines often started before they got out of their teens. Now the procedure is being opened to young men - but with restrictions. Because losing hair at such a young age is very traumatic, hair transplant doctors do not like to go along with the patients' snap decisions. One reason they do not happen more is that antibiotics are given before and after the procedure to prevent infections from even starting. 9. Cysts. Cysts can come up in the areas where the hair is being transplanted to, also called the recipient areas. The cysts do not usually last more than a few weeks and are rarely more than the size of small pimples.