Hello, are there side effects if I continue to receive lip filler every 12-15 months? I would like to have 1 or 2, 1ml syringes of Volbella. I want my thin lips to look natural and not overfilled. But I'm concerned with repeatedly having my lips filled over the years, that it would enlarge or expand the lip tissue. Can the amount of fillers I have injected permanently stretch the skin and cause the lips to sag and deflate when the filler degrades? Thank you