Is late onset infection or cheek fillers common or something to be concerned about?

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Please, remember it's always safer to see your doctor for concerns.

Delayed infection can certainly occur for many months after treatment. Bacteria can be introduced at the time of treatment. This is a well known (but not common) complication
It is very important that you have this checked by a doctor who specialises in this area (ideally by the doctor who treated you)
The antibiotics used in this situation are very specific . Also the filler may need to be dissolved. 
The doctor will also exclude granuloma formation in the area

I would pay a visit to the doctor who was treating you originally with the fillers. Good luck from New York City

Hi jkelly, without knowing too much of your filler and injection history, it sounds like you may have what is called a granuloma. Granulomas appear late (usually after 6 to 24 months) at all injected sites approximately at the same time; they grow quickly and suddenly.  This is estimated to occur in every 1 in 100 to 1 in 1000 filler patients. The first-line treatment would be to inject steroids in the affected areas to calm the inflammation. Sometimes antibiotics and hyaluronidase are also used. You should see a doctor or nurse practitioner who injects lots of filler, frequently. Someone with a great deal of filler experience will be the best person to handle your situation. Good luck and hang in there!

As with any procedure.  Whenever you suspect there could be an issue, you should always go back to your doctor with your concerns.  Your safety comes first!