SkinCeuticals Discoloration Defense 30ml/1 fl oz Retail: $115 Daily dark spot corrector targets visible skin discoloration for brighter, more even-looking skin. Discoloration Defense is a layerable, daily-use dark spot corrector clinically proven to reduce the appearance of key types of skin discoloration in all skin tones, including hard-to-treat forms such as stubborn brown patches and post-acne marks. Formulated with 3% tranexamic acid, 1% kojic acid, 5% niacinamide, and 5% HEPES, this serum for dark spots improves the appearance of skin discoloration, brightens skin, and evens skin tone in as early as 2 weeks.