welcome to healthcare magic.
i will be glad to be of assistance.
i can understand your concer.
but its important to first understand why are you getting this pigmentation and since how long do you have it. whether its an internal condition that needs to be controlled in order to treat the pigmentation or not.
i would recommend that either you send a picture if possible or request your doctor to run a few basic blood tests for you for thyroid
meanwhile you can use the glycolic acid
12% cream at night daily on the affected areas.
also using a sunscreen on the exposed parts will be helpful.
if there is no internal cause detected, then even TCA
peels will be effective which your dermatologist
can do for you.
please let me know your queries.