Hydroquinone works as bleaching agent for skin and works as skin-lightening agent.Application: Skin bleaching agentDose: Hydroquinone works by blocking the process in the skin that leads to discoloration. Hydroquinone helps to lighten the dark patches of skin caused by pregnancy, injury to the skin.Note: Benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene.