“Hydroquinone 3% W/W” is a topical medication for treating skin hyperpigmentation. It works by lightening darkened areas of the skin. Apply a thin layer to affected areas once or twice daily, as directed by a healthcare professional. Watch for common side effects like mild irritation. Avoid contact with eyes and broken skin. Store at room temperature, away from moisture. Consult a healthcare professional for guidance on usage and potential side effects.