Botox on Crows Feet Causing a Droopy Lip

The complication you are describing is a potential side effect of injecting Botox in the crow's feet.  It occurs when the crow's feet wrinkles below and to the corner of the eye are injected or injected incorrectly.  The cheek muscle can become affected or relaxed, which in turn can affect your smile. 

Unfortunately there is no "reversal" available to you, but if you smile a lot, hopefully that means it will wear off more quickly.  If not, you will probably see the problem affect you for about 3 months.

Perhaps this diffiused to inlvolve the deeper zygomatic muscles in which case it may take close to 6 months to dissipate completely. 

If the Botox was injected near the cheekbone and under the eye trying to chase some lower Crows feet lines, then the smile muscle can be affected. it may take three or more months for it to come back to normal. It is not permanent, unless there is another reason( coincidentally )  for this to occur such as Bell's palsy.