Ok so I took my BP out of his tank tonight and noticed something on his nose. I tried to gently rub it off and it wouldnt come off so i tried to figure out what it was. I'm almost 100% sure that it is skin off his nose because it looked a little scratched when I inspected closer. I noticed that at night he keeps rubbing his head on the top screen that covers his tank, how can I stop/prevent this or is there no way to do so. I just dont want him hurting himself because he keeps scratching.