Dark & Dry skin underarms and between legs...please advice

i have a very dark skin between my legs and under arms.well underarm maybe was caused by spray. but between legs i think maybe of walking and it scratch to each other which starts with burns then gets dry and dark..so is there any way to get rid of it as i'm working out lately to loose some kg's after being over... show more i have a very dark skin between my legs and under arms.well underarm maybe was caused by spray. but between legs i think maybe of walking and it scratch to each other which starts with burns then gets dry and dark..so is there any way to get rid of it as i'm working out lately to loose some kg's after being over weight.please help its anoying as i have to stop the next from walking where i dont want any breaks.....:(
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