Lumps appearing a few weeks after chin lipolysis injections

About 3 months ago, I had fat-dissolving injections in my chin area. I didn't feel any discomfort at the time. About 3 weeks after the injection, I noticed a small lump in my jawline. At first, I thought it was just a swollen lymph node due to stress, so I visited a general practitioner and took anti-inflammatory medication. Since there were no other symptoms, I didn't pay much attention to it. Another month passed, and after things settled down, I realized the lump was still there and had actually grown larger. Because the jawline is near the throat, I’ve also started feeling a sense of pressure. I immediately saw an ENT specialist, had an ultrasound, and underwent a fine-needle aspiration. However, the report could not confirm whether the lump was benign or malignant, so I need to schedule a repeat biopsy using a core needle. Currently, I only have the ultrasound and fine-needle aspiration reports. If this lump was caused by the fat-dissolving injections, what specific characteristics should I look for in the report? How can this be treated? Is this a common complication? Thank you, Doctor.