Can Kybella cause under eye swelling?

While Kybella will cause swelling in the treatment area, it should not cause any reaction in the rest of the face. My guess is that your eye festoons are unrelated to the Kybella. Hope this helps. 

Kindly,

Kouros Azar

Thank you for your question.  Kybella works by dissolving fat cells which lie just below the skin under the chin and jawline.  As the fat cells dissolve, this gives definition to the submental (under the chin) region.  A side effect is swelling and numbness under the chin, but you should not have swelling under the eyes after Kybella.  I would discuss this reaction with your injector, as well.I hope that this helps!-David Gilpin

It is very unlikely that the Kybella injected is related to the under eye swelling.  The inflammation is usually localized to the area injected.