Hydroquinone is generally referred to as hydroquinone cream, and there is no clear rule that it should not be used for more than a few years, but long-term use is generally not recommended. Hydroquinone cream is a kind of skin fading agent, often used in the treatment of various pigmentation, such as freckles, chloasma, through the persistent application on the skin has the effect of fading pigmentation, and the effect of the medicine is relatively slow, and often need to be applied for a few weeks, pigmentation can be reduced, but the specific duration of the medication depends on the situation of the treatment. If the patient after applying hydroquinone cream for two months, there is still no obvious improvement, usually need to stop using the drug after two months of treatment or follow the doctor’s advice. Some patients who have had better results with the medication and have seen a significant reduction in discoloration may continue to apply it until normal skin color is restored. Hydroquinone cream must be guided by a doctor to use the drug, the patient can not use the drug at will, if the drug ingredients are allergic to the person prohibited.