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. A certain type of alopecia results in eyebrow loss. Excessive plucking can be a problem, too. Burns, tattoos, and infections can cause the eyebrow hair to fall out, and some people just are not able to grow eyebrows at all. Hair transplant surgery for eyebrows is different because eyebrows are different from scalp hair. Mega-sessions where thousands of grafts are done in one sitting help to shorten the overall time. However, the length of these sessions is often grueling. 5. Hair transplant surgery may be combined with other procedures. If you do not have enough hair, you cannot have a normal hair transplant surgery. Your doctor will need to prepare you for the surgery so that you will know exactly what to do to make the procedure go better. If you follow instructions, you will have a much better outcome. When the doctor sees you a couple of weeks before surgery day, she will go over again exactly what procedure you are getting. If your doctor uses the follicular unit grafts for your hairline, it will look much more natural than with the larger plug-like grafts. This is important because your hair transplant will be noticeable if the hairline is not done well. 2. Your hair transplant site will be fuller if you have higher density in your donor sites. The first part, and the one most people getting hair transplant surgery are interested in, is the hairs. There should be one to four full hair follicles in the unit and one or two fine hairs as well. There are sebaceous glands in the follicular unit which produce oil. The follicular unit is a living unit with muscle, nerves and blood vessels that are all tiny enough to fit into this small package.