How to fix discolored lips? I'm 27 yr old black female non-smoker. Doesn't wear makeup. (photos)

Well I have this problem of constantly bitting my bottom lip when I'm nervous around people. I've tried very hard not to but its the only thing that gives me comfort. Its even gotten worst when I feel like people are looking at the discolor of them which makes me want to hide it more. My bottom lip is light pink on top where it looks like its been peeling and a dark ring in the center. I found some pictures online to give you an idea of what I'm talking about .Thanks!