Swelling after lip filler. I squeezed one side as it is bigger than the other. Will that make it worse?

Thank you for your question.  Without photographs it is difficult to make definite recommendations, but if the bigger side was the result of an imbalance in filler placement, some improvement can be seen with gentle massage.  If you were to squeeze the area too aggressively, however, it may cause significant swelling, blurring your results.  I would recommend some cool compresses to your lips to try and reduce the swelling, and close follow up with your injector to ensure your results are what you anticipated.