The TRIA Laser Hair Removal Sysatem is the first adn only FDAcleared laser hair removal system available that usesd the same trutsed laser tecjhnology as the proefssionals and provides the same permanent results at ohme. ..... gtreated containing retinoids (retin a, tretinoinj, altinac, avita, trans retinoic acid, vgitamni A acid, tazorac, adapaledne, differin), or AHA (aplha hydroxyl acids, glycoilc acid) stop using the cosmetiic at elast two days before the laser treatment. ...