The lack of hair growth following trauma to the scalp is most often due to varying degrees of damage to the hair follicles at the same time as the trauma. If the integrity of the hair follicle has not been damaged, hair will generally grow back and can be supplemented with vitamin B complex to help with hair growth. However, if the hair follicle has been damaged or a large scar has formed locally, there are no specific medications available in this case and the only way to solve the problem is through a hair transplant.