I had previously had half a syringe of juvederm and restylane in my lips , once i noticed theh began to fade 6 months later i went back and got a full syringe of juvederm . I was please with them i got them in november 2014 however the past month or so ive notcied they have been looking uneven and slightly droopy . what could be the cause ? Or could it be i hadnt noticed they looked weird until now