The messenger of Allah (may Allah’s peace and blessings be upon him) cursed the woman who fixes hair extensions (to another) and the woman who has them fixed for her, and the woman who does tattoos and the woman who has them done for her. [Al-Bukhari]

"«لعن النبي -صلى الله عليه وسلم- الوَاصِلَةَ والمُسْتَوْصِلَةَ، والوَاشِمَةَ والمُسْتَوشِمَةَ». [صحيح.] - [متفق عليه.]"