Kybella injection more swollen and feels hard and tender to touch on day 3?

Thank you for your question.  Kybella is the only FDA approved injectable product for submental (under the chin) fullness caused by fat.  Typically Kybella is injected in a specific pattern under the chin, and 4 cc's is injected at one session.  The sessions are usually spaced at least 6 weeks apart to allow for all swelling to resolve.  Typical, expected side effects of the injection include swelling, brusing, and numbness under the chin. It sounds as if you may have had 1 vial injected, which may not give you the results you are desiring.  I would consult with a board certified injector who has experience in injecting Kybella for a full evaluation.  I hope that this helps!-David Gilpin 

Thank you for your question. Kybella is an innovative injectable that provides a dramatic reduction in submental fatty tissue, sculpting the chin in a quick office visit, with no downtime. You can immediately return to work or school. There are no restriction on activities or exercise. Most often, patients can see their improvement in 2 treatments, but the amount of treatments may vary based on the patient's unique needs and treatment plans. 
Best wishes,

Every neck is different and will therefore require different amount of kybella.  The swelling with kybella can be significant so not surprising to hear the amount of swelling you are experiencing.  I educated patients that it can last anywhere betwen 2-4 weeks.  With that said, some of the swelling can be caused by a hematoma.  Best to go back to your injector and let them evaluate your neck.  Best of luck!