AHAs and BHA such as glycolic acid, lactic acid, and salicylic acid can be helpful in gradually lightening pigmentation as well as reducing odor and sweating on the underarms. It has been recommended to use specific cleansers that contain salicylic in order to gently exfoliate:)
this one is a common one with salicylic acid:
try using brightening products such as vitamin c or niacinamide. usually for facial products that dont work on my face i use it on my body. and chemical exfoliate once a week
There is a deodorant that I'm using currently that contains exfoliants and lightens underarms as a bonus! I prefer the unscented version as the scented one smells too much of herbs to me that it sorta reminds me of food lol. I saw results for sure with regular use. It does sting a little the first times if you've never used exfoliants there. Hope this helps!
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