Cos De BAHA 2% Hydroquinone Brightening Serum is an excellent choice for removing dark spots on the face. It works on acne, dark spots, and melasma. This potent serum has 2% Hydroquinone, which makes skin lighter. Arbutin, Niacinamide, and Kojic Acid are some of its whitening ingredients. It helps even out your skin tone by stopping your body from making melanin.