Hydrogen peroxide has been used for many years to treat skin conditions, including dark spots on the face. It is an effective way to lighten the dark spots on the face because it helps to break down the melanin in the skin that causes the dark spots. However, it can also cause skin irritation and dryness. It is important to use the correct concentration of hydrogen peroxide and to patch test before using it on the face. Additionally, it is recommended to use sunscreen when using hydrogen peroxide on the face to protect the skin from further damage.