Combat stubborn skin discoloration with SkinMedica Lytera 2.0 Pigment Correcting Serum. Formulated for all skin types and complexions, many people begin seeing the results of using this powerful face serum in just two weeks, with the most drastic results at 12 weeks and beyond. It’s even appropriate for people with sensitive and acne-prone skin, as this formula is noncomedogenic and free of common irritants, including fragrances, parabens, retinol, and hydroquinone.