It is possible to see bumps after the use of any injectable filler including Restylane and Juvederm.  The bumps are caused by too much of the filler being injected at one point in the skin, and also injected too superficially.  With good injection technique, bumps should be very rare.  They should happen less than 5% of the time and be very small and hardly noticeable when they do occur.  The good news is that the bumps do tend to flatten out over a period of 2 or 3 months.

If the bumps persist and are quite unsightly, they can be treated with injecting the bumps with a medication called Hyaluronidase.