Hi, Yasemin. The best 2 brown spots treatment ingredients available over the counter are Arbutin and Kojic Acid.
Arbutin is a natural derivative of hydroquinone derived from plants, including bearberry, blueberry, and cranberry. Some cosmetic products contain 3% concentrations, which studies show can significantly lighten the skin. Kojic Acid is an antioxidant derived from a fungus. It works by breaking down melanin in the skin and preventing its production in the skin. Kojic Acid is found in cosmeceuticals in 1% to 4% concentrations either combined with other skin-lightening agents or by itself.
Check out the tips section of your personal plan for some specific products suggestion to fade your brown spots. 🙂