The Prophet ﷺ has cursed the lady who lengthens her hair artificially and the one who gets her hair lengthened, and also the lady who tattoos (herself or others) and the one who gets herself tattooed.
لَعَنَ النَّبِيُّ ﷺ الْوَاصِلَةَ وَالْمُسْتَوْصِلَةَ وَالْوَاشِمَةَ وَالْمُسْتَوْشِمَةَ