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Do you have dark underarms? I have the answer why. shaving underarms, or using cream hair removers cause them to get dark bc, after shaving, hair grows thicker, and there are many chemicals in cream hair removers..
start getting your underarms waxed from a good salon....
get them waxed at least once in a month ..waxing would remove the dead skin layer and blackness from your skin
scrub your underarms regularly while bathing with a good loofah.. Also, a natural remedy you can use is rubbing lemons, it`s going to be a process though.