I received Restylane & Juveederm in my lips for the last 4 years. Slowly over time I noticed my lip on the right side (left side in picture) started to "split." I had filler injected in that gap but it didn't get filled for some reason, my lip just kept splitting. I then had hyaluronidase injected to try to even out my top lip but that was only a temporary fix. Eventually my lip started to split again. How can I fix this without surgery?