Shine & Glow. Hydroquinone is used to lighten areas of darkened skin such as freckles, age spots, and acne scars. Tretinoin is used to treat acne. It may decrease the number and severity of acne pimples and promote quick healing of pimples that do develop. Mometasone Furoate is used to treat skin conditions such as eczema, psoriasis, allergies, and rash.