I had healed a small strip in the middle of my lip by leaving it alone.It took a few weeks of trimming. My lips healed differently then, not even a year ago. I didnt even use anything on it. I trimmed with nail clippers then.Scissors are much easier. I brushed flossed, ate, drank, everything all normally too. If you leave it alone long enough it should heal like our regular skin does. Unless it starts to get infected. Hard to do with constant contact of food that creates bacteria. Im not sure why my lips heal different now. Probably too many chemicals trapped inside.