I recommend seeing your doctor to determine if this lump is from the Juvederm or a granuloma at which point treatment can be determined. It is rare that Juvederm lasts more than a year but it does occur in some instances.
Even though Juvederm is only supposed to last about a year, and about 4-6 months in the lips, I have seen it last much longer. Particularly in the tear trough, I have dissolved Juvederm over 2 years from its placement by other physicians with hyaluronidase. I I would use this for your lips. It might require 2 treatments.