Dark spots on the back of neck and underarms!Advice Please!?

I'm 18 years old and since I could remember i've had this. It's really embarrassing. There's a dark spot right where the crease of my neck is on the back. I can't where my hair up without something there covering it. I'm using this whitening cream to help but i haven't seen any changes.... show more I'm 18 years old and since I could remember i've had this. It's really embarrassing. There's a dark spot right where the crease of my neck is on the back. I can't where my hair up without something there covering it. I'm using this whitening cream to help but i haven't seen any changes. Please anyone if you have any advice then please, tell me. I'm willing to do any kind of treatment to remove this dark spots.
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