The recovery method for gray hair in the back of the head area needs to be selected based on the characteristics of the clinical symptoms. If the gray hair in the back of the head is widespread, consider that it may be caused by a deficiency of kidney essence after the hair turns white. You can choose to use oral blood nourishing hair capsule with He Shou Wu infusion for treatment, the recovery period is relatively long, if the back of the head area white hair is dotted, densely arranged in a certain area, while the rest of the hair is normal black, you need to observe whether the skin is also white. If the skin at the root of the hair is porcelain white change, consider vitiligo causing limited white hair, you need to choose to use oral thymidine enteric tablets to improve your immunity, and then use 308nm excimer laser to irradiate local skin, along with tacrolimus ointment for treatment. When the local skin is completely restored to normal condition, there is a certain probability that the hairs will return to normal color.