How can skin clear up like dark parts on your neck and underarms?

It%26#039;s weird my cousin has it and she%26#039;s like super clean Lily showers at least once a day. She%26#039;s gone to the doctor and they say that they don%26#039;t know how to clear the skin up to match the rest of her body. So if anyone can help thanks.|||Well I%26#039;m not sure what you mean by dark parts but I have a big dark scar on my leg and I use pure vitamin e oil. try it. it really helps. You have to pout it on three days everyday!