i have hyperpigmentation on my body though since i was 5 years old and as i grow older and scratch my skin for any particular reason or i get bitten by anything it leaves these marks that do not want to disappear.
Clinique have a new product called Even Better Skin Tone Corrector which will fade marks such as these. Bio-oil and Palmer's Cocoa Butter Scar formula are also good.
Loiloi x
Do you have any other associated symptoms of itching, rash , etc.
You should try to avoid sweat collection in the areas, keep the areas clean, maintain good personal hygiene, wear lose comfortable clothes. Apply calamine lotion at the sites. You should continue using the sunscreen.
Consult a skin specialist for your complaints and discuss whether a demyleininzing agent would help in your case. You could also discuss about dermabrasion or laser therapy in your case with your doctor.
Let us know about how you are doing and if you have any other doubts.