Obagi Nu-Derm 4 Exfoderm ForteA lightweight, exfoliating skin lotion that buffs away dead skin cells to promote healthy cell renewal for a more radiant complexion. Best for: hyperpigmentation and uneven tone. Suitable for oily skin. Exfoderm Forte is formulated with Alpha Hydroxyl Acids, which exfoliate dead skin cells and aids in the absorption of treatment ingredients. This product is recommended for oiler skin types and is the fourth step in the Nu Derm system for these skin