Can Botox or filler (Radiesse) cause yeast infection?

Hello, Botox should not cause a yeast infection.  The timing of the injection and your problem is more likely to be coincidental.

I think that the history that you have given also provides us with your answer.  Botox and dermal filler, including Radiesse,  will not lead to vaginal yeast infections.  However, antibiotic use during and following breast lift surgery can!  It does not necessarily occur during antibiotic administration but can occur after completion of your course of antibiotics.  I would suggest discussing this with your gynecologist and make certain it is a yeast infection and treat accordingly. 

It is highly unlikely that the botox has had any contribution to your vaginal issues. My recommendation would be to schedule an appointment with your OBGYN for a checkup.