Scratching After Hair Transplant

My question is regarding the itchy sensations and the followup scatching done after receiving transplants.

Will the possible infection to the scratched area cause the grafts to not grow

These types of questions should be addressed before and after surgery with the doctor you obviously trust and respect enough to perform a hair transplant procedure on you. Yes, you can scratch your head gently and the grafts will not get infected unless you do it constantly. The new grafts are sensitive to injury and if you irritate them with scratching, you can develop a folliculitis.