After a hair transplant, you should protect your head from any injuries very well. Bumping your head or frictions can cause the transplanted hair follicles to remerge on the surface of the scalp. This can cause the hair transplant to be ineffective. Therefore, we advise our patients to protect their head after their transplant. Because they had local anesthesia, they will temporarily lack sensation on their scalp. It is best to be careful and not hit your head, and protect it from any kind of trauma.