First we want to find the reason for the hyperpigmentation, then treatment. Some time your natural remedy will work. If this hyperpigmentation is due to rough repeated rubbing with hand on that area, then avoid this treatment. Some time this pigmentation will be seen in people having dandruff, so such condition take treatment for dandruff.
Next Steps
Please mention your age, body conditions(lean or fat) and other allergic reaction
Health Tips
Avoid direct sun
Avoid too much repeated wash and rub with hand in face, use tissue instead(do not rub).
Take treatment for dandruff if required.
Drink more water
Do not try different cosmetic and other tips from books.