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sorry its a home remedy. but it has actually worked for my mom!(:

you have to be sure you dry that are very well after showering.

you can put lime juice on them. it wont burn unless you have a recent cut from a razor or something.

what has worked best fro my mom is baking soda! just rub it on like soap while you shower.

You need to start exfoliating under your arms. The dark area is caused by a build of sweat. Underarms are tucked away and always chaffing and sweating. Buy an exfoliating glove/loofa and some body scrub. Every time your shower, which should be once a day, exfoliate underarms. The colour will gradually lighten.

Truth be told, no one will probably notice. But I know how it feels when you're not comfortable. I would look online for skin color treatments. It would definitely take away the look!

its called puberty ******