If the lumps last longer than 2 weeks, they may need to be dissolved with hyaluronidase. Always seek treatment from a qualified doctor. Why? Massaging the treated areas can alter the dermal filler and cause the hyaluronic acid solution to slip out of place. This can result in an uneven or lumpy appearance.
Juvederm should have been massaged after it has been injected. Your injector should have. It's better that they do it if they didn't. If you are not comfortable returning, then you should try to push a little to make this more even.
It's important to try to do this the first week, as it's easier to do this now than later. Juvederm is injected in lines, but it is mainly injected into areas if indicated. Each person heals differently, but their body may need up to 2 weeks to fully integrate the injected product. Patience is vital during this process.