Swelling and pain one week after Kybella?

Yes, the swelling will resolve in a few weeks. In the mean time, it can be improved with venus legacy and lymphatic massage. For best results with Kybella, I recommend a combination approach with thermage/ultherapy/exilis. VASER liposuction in combination with ThermiRF or ultrasound are best for contouring the chin, if you're a candidate. See an expert. Best, Dr. Emer

Thanks for your question! Swelling underneath the neck is normal after Kybella treatment, and occurs because the medication causes fat cells to die / rupture (lyse). The contents of the lysed cells need time to be absorbed by the body, and this process causes the symptoms of redness, swelling, etc. The swelling can dissipate within the first 1-2 weeks, but in 20% of patients, the swelling lasted more than 30 days. Rest assured, even if it lasts for over 1 month, the swelling is not permanent. The patients studied were followed up 3 months after their last injection, and the improvement was noted at that time. You may see improvement before 3 months, but this is just a reminder that you may have to be patient.
Also, you may need repeated injections to obtain the results you desire. Repeat injections should be performed at least 1 month apart. Some say the swelling is not as bad in the later injections as it is in your first one. 
In summary, everyone responds differently to these types of treatments, and with cosmetic procedures of any kind, patience is key. Good luck, I hope this helps!