Welcome To HealthcareMagic forum,
I would like to know few things here.Do you get itching between your legs(groins)? Do you see any redness
or peeling of skin there ?If so then you need to take a course of anti fungal medicine along with some topical creams .If there are no such symptoms then probably its just dark due to friction.
Its nit very easy to lighten up this pigmentation .You can try creams like hydroquinone
over there.Glycolic peeling is not going to help much.
One thing you can try is LASERS.There are specific lasers like q-switched nd:yag laser which can work good over there. But this laser is not available at all the clinics,you need to find out a good laser clinic which has this facility.
If you can tell me where you belong to then probably I can help you find a good clinic.