Filler migration above lip after dissolving. Is it residual migration or scar tissue? (Photo)

I've been thru 2 rounds of dissolve to address migration on top lip, including completely dissolving lips. I want to refill but still see it, especially when I press my lips together. Could it be scar tissue & more dissolving will not help? I have concerns about continuing to dissolve as I believe it's eaten some of my natural tissue & am reading stories on here about people with permanent damage from dissolving, but am worried if I refill the migration will come right back & be more obvious.