Sun exposure after hair transplantation may have some effects, such as causing infection, affecting healing, and affecting follicle viability. 1. Infection: Because hair transplantation requires healthy hair follicles from the back of the head, the incision in the hair supply area and the wound in the hair transplantation area have not healed during the process. If you are exposed to the sun after hair transplant surgery, it will stimulate the secretion of local sweat glands, which is very likely to lead to bacterial invasion and cause infection. 2. affect the healing: the recovery of the hair follicle wounds need a certain amount of time, if this period of time by a strong ultraviolet radiation exposure, will stimulate the local secretion of sweat glands, the surgical area can not maintain a clean and dry environment and affect the normal healing of the surgical incision. 3. affect the survival of hair follicles: if just hair transplantation on the sun, the hair follicles at this time is still very fragile, not fully survived, direct sun will affect the healing of the surgical area, increase the chances of trauma infection will affect the survival rate of hair follicles, affecting the effect of hair transplantation. To summarize, it is recommended to rest more after the hair transplant surgery, if the sun found that there are symptoms of discomfort in the area of the hair transplant, you need to consult a doctor in a timely manner, so as not to cause adverse consequences.