Lower lip deviation after Botox may be amenable to some degree of correction depending upon the actual muscles involved.
Solution of Deviation of Lower Lip Following Botox?
Doctor Answers 4
Botox and lips
Sorry, it's very difficult to answer your question without more information - you should consider posting a photo or explaining in further detail.
Botox and lip deviation
More information is needed but I assume you had Botox injected into the lip. After about 4 months the Botox will wear off and things should be relatively back to where they started.