When Does Botox Cause Bags Under the Eyes?

Botox can cause bags of the lower eyelids if someone is prone to fluid retention from chronic allergies, sinusitis or other  systemic problems. The botox, if injected close to the lower eyelid muscle, weakens the pump action so that fluids are drained away as they would normally be. Fortunately the botox will wear off and the bags of fluid should disappear eventually as the botox has worn off. I am not aware that Botox could cause bags of fat to protrude, unless there were some abnormality of the orbicularis oculi muscle that sits on top of the fat and the relaxation of the muscle would allow a herniation of fat to extend forward.

Botox can not make you have under-eye bags if you did not already have them, most likely the muscle around the eye was weakens with your botox making them more noticeable to you, this will wear off as the botox wear's off.

I usually stop Botox treatment at the midline raphe ( image a straight horizontal line extending from the outer corner of the eye.  Below this point, the agent can weaken the orbicularis oculi muscle that helps the lower eyelid from sagging.  Weaken this and guess what?--you get a little bag at the top of the cheek.  This will eventually wear off.