Skin around my mouth (from my nose on either side, similar to laugh lines) is darker than the rest of my fa?

It makes me look a lot older (I'm only nineteen). I'm anemic, could that have something to do with it? I also have dark circles (although that may be hereditary), and my skin scars very easily, so I have dark spots when I get acne. Could it be from touching my face too much? I chew on the inside of my lip so I press on the area around my mouth a lot. Is there someway to make all the skin on my face the same color (sans makeup)?