Skin inside nose is darker, why? What is the skin inside the nostril floor called and what can be done to lighten it?

My nostrils are asymmetric. I have a scar below my nasal sill and it's tighten my skin there and pulled the sill down towards my lip and you can see inside my nostril and because it's very dark skin colour compared to my skin I need to know what the skin is called above the sill and how to lighten it. I can't get it pushed back up into its original place as this would pull my lip up. It's also impossible to raise the sill up inside my nostril now as far as I've researched. Thanks

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