Hard Pronounced Cheeks After Juvederm Voluma?

With any injection there will be some swelling and possible bruising creating hardness where you were injected.  Re evaluate your injections in a week and if you still see some unevenness then call your physician. 

 Voluma should add volume to the cheeks to give it that contoured look and improve the 'hollow' appearance. If you aren't satisfied, after a second appointment see a more experienced doctor to get the best results or consider reversing with hyaluronidase. it takes 2 weeks to see the swelling go down. Radiesse and sculptra are good alternatives.

At the moment you are affected by swelling which should resolve over a few days. Lumps and bumps usually resolve on their own, once the filler starts to get incorporated with your own skin tissue. It would be best if you book a follow up appointment with your injector in 1-2 weeks, and he/she can massage any residual lumps or bumps at that time.