Is hair transplantation permissible?
Hair transplantation is a form of treatment for baldness. It involves taking hair follicles from parts of the body/head and attaching it to the balding area.
Hair transplantation entails making use of detached solid parts of the human body for medical treatment which as a rule is not permissible.
Making use of a detached solid part of the human body for treatment is only permissible when the detached part is returned to its original place (e.g. a fallen tooth or a cut finger is put back in its place).
Hence, hair transplantation is not permissible as it would fall under the general impermissibility of making medical use of detached solid parts of the human body.