Exfoliation is key to achieving more youthful-appearing skin. Obagi Exfoderm Forte is an exfoliating lotion and the essential fourth step of the Obagi Nu-Derm System. Active alpha hydroxy acid ingredients, 6% glycolic acid and 4% lactic acid, work to eliminate old skin cells and promote new skin cells, giving you lighter, smoother and more toned skin. Designed for normal to oily skin, Obagi Exfoderm Forte is the fourth corrective step of the Nu-Derm system and is a key part of the Obagi skin products skin renewal system. This exfoliation enhancer lotion is ideal for skin that needs deeper exfoliation, and it is also a great treatment for hyperpigmentation due to pregnancy, mask of pregnancy and melasma.