SkinCeuticals Discoloration Defense SerumSkinCeuticals Discoloration Defense Serum is a high potency face serum designed to visibly reduce dark spots, post blemish marks and uneven skin tone while boosting overall radiance. Formulated with 1. 8% tranexamic acid, 5% niacinamide, and 5% HEPES, this targeted treatment serum helps brighten, refine texture and support the skin barrier. Suitable for all skin types and tones, it visibly balances and evens skin for a healthier, more luminous look.