I had a biopsy done over 3 years ago and I still have a huge scar that's way worse than peeling lips ever were. It's a hard, discolored, partially numb lump of scar tissue and I can still see the cut lines. And the biopsy didnt even reveal the reasons for my lip problems. After that I looked over the peeling lips forums for biopsy results and no one has ever discovered the cause of their peeling lips from a biopsy. A biopsy will only make things worse.