Hydroquinone is a skin-lightening ingredient found in many skin care products. It works by reducing the production of melanin, which is responsible for the pigmentation of skin color. Hydroquinone can be used to treat dark spots, age spots, and other forms of hyperpigmentation. It is available in different concentrations ranging from 1%-4%, and should generally be used as directed under the supervision of a dermatologist or other qualified health professional. Other than lightening skin tone, hydroquinone can also reduce inflammation and improve overall skin texture. With regular use, it can make the complexion look even and give a radiant glow to your skin.