Is hair transplantation permissible for someone who is bald, or is it forbidden like hair extensions?

Hair transplantation is permissible. It involves transferring hair follicles from one area of the head to another on the same person, because it is considered a removal of a defect and not an alteration of God's creation. Sheikh Ibn 'Uthaymeen issued a fatwa permitting it, on the grounds that it is a restoration of what God created and a removal of a defect, not a matter of beautification or an addition to creation. He cited as evidence the story of the bald man whose hair God restored.