Pictures may help to diagnose the problem accurately. If possible kindly book a direct online consultation or send an inbox message so that we can look into the best way for you to get rid of the pigmentation.
I will leave a link of an article that may help you out for some relief should you need it.
https://www.practo.com/healthfeed/most-affordable-skin-care-mantra-for-naturally-visible-plump-skin-45373/post
Next Steps
you can try some
vitamin C creams but be careful of not letting it oxidise.
Health Tips
avoid letting the area dry out, if you apply spit to any of these areas, stop it instantly.