Swelling and bruising is a common side effect of injections. Swelling usually lasts approx. 2 weeks. Seek out an expert injector if these symptoms do not subside or get worse for an in person assessment.
All the Best.
I suggest warm compresses and an antiinflammatory such as ibuprofen. I would see a doctor pretty soon if the area gets larger or painful. You want to confirm there is no infection or inflammatory reaction from the filler placement. Although, this could just be a simple acne cyst developing. Best, Dr. Emer.