Some discoloration may be permanent. I would use Luminase and Exfolase creams followed by fractional laser to reduce the pigmentation. Best, Dr. Karamanoukian#Realself100 Surgeon
Chronic moisture can cause skin irritation and result in hyperpigmentation of the inner thighs , posterior thighs and knees, underarms, buttocks and back.
Before you spend $$ on peels or IPL, try these topicals.
This is called post-inflammatory hyperpigmentation (PIH).
I recommend Melarase AM ...
Dark underarms can be lightened with topical application of Melarase creams and Melapads. Both products will work over time to even out your skin tone. Best, Dr. Karamanoukian Los Angeles