Peter Thomas Roth Ultra Gentle Botanical Skin Brightening Gel Complex,a gel formulated for all skin types, especially very sensitive. Contains the skin brightening properties of kojic and azelaic acids. Oil and hydroquinone-free. Brighteners may be used if you are allergic to hydroquinone, or after the maximum benefits of a full six month treatment cycle of our 2% hydroquinone Lighteners is completed.