High quality discolored bath towels (Glencoe, IL)

Thick and heavy bath size towels. Heavier than most bath towels, almost like the thickness of some bath mats. DISCOLORED from acne medication. Used very little and are in great shape other than the discoloration. They are not fuzzy and do not shed and a such a nice quality towel. Might look better if soaked in bleach to make them all the same color? Might be nice for a dog shelter?