I know tan lines on your face from wearing sunglasses can be particularly frustrating, since they are prominent and can't be covered up with clothing. Thankfully, there are simple home remedies that can help speed up skin cell renewal to fade tan lines, and easy ways to cover up and disguise the lines as well.
Cut a lemon in half and rub the inside on darker skin for one to two minutes. Then rinse your face. The acidity in lemon can bleach out dark skin and help fade tan lines. Do a patch test with the lemon juice first on an inconspicuous part of your body, to be sure that your skin does not have any reactions to the acidity.
Use an exfoliating brush or sponge in the shower, focusing on the tan line itself. Be gentle with the skin on your face, as too much rubbing can cause irritation and redness. While it won't get rid of tan lines altogether, it will speed up your skin's cell renewal process, slowly fading the tan.
Apply a facial lotion with alpha-hydroxy acids (AHAs) or beta-hydroxy acids (BHAs), which shed dead skin cells and fade the tan line. Be sure to sure a moisturizing lotion specifically labeled for the face, since body lotions can have higher concentrations of the acids and might damage fragile facial skin.