Hello! There could be a few reasons for darkening of lips such as smoking ,dryness, sunexposure,product application. In wheatish skin type it may develop with age. Peels on lips can be cumbersome as it would cause dryness and lips may be irritated when eating food. TCA peels are strong peels and can cause extreme dryness hence not very advisable. Other option is q switch ND yag laser which has seen to be promising in such cases with less downtime as compared to peels.