Is it possible for lip fillers to burst out?

Hi and thank you for your question.

It is very early for infection although you must be vigilant for this. it sounds as if some product is escaping and you may have inflammation. See your practitioner for a check up as soon as possible.
Hope this helps and wishing you all the best,
Stay Safe, Happy & Well,Dr Murray from Absolute Cosmetic Medicine, Perth

Yes this is possible. This can happen close to time of injection. I suggest you make an appointment to see your treating physician to have this resolved.

I have seen this happen twice in 10years, so very unusual.  Both times it was through mucus membranes (once via the inner pink lip, the other into the lower conjunctiva of the eyes)  Both times there was inflammation (redness) of the skin.  Both resolved without complication.  Unfortunately, the material is lost and re-injection maybe necessary.  However, on one of these occasions it was actually the second time ( two different providers) for a patient and the material extruded again.  I cannot identify anything in the injection technique that leads to this.

I have not experienced any extrusion of Juvederm post injection in the lips, or anywhere else for that matter.    With that being said, you need to get back in to see your doctor as soon as possible to determine if there is an issue.  Very best wishes to you.

This would only be possible very close to the time of injection. I suppose it is possible in your case. I would think only a very small amount would be able to extrude from a prior injection site.