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Hydroquinone has been used in the beauty industry for decades to lighten dark spots on your face from hyperpigmentation, age spots, or freckles. It comes in a non-prescription strength up to 2% concentration in serums or creams that is available over the counter for home treatment, and up to 4% for prescription strength. The effectiveness of hydroquinone working as a skin lightening agent resulted in its popularity, but there has been some controversy surrounding its adverse effects. Hydroqu …