Botox, Dysport, Xeomin typically lasts 3-6 months. Studies have shown that for men and women who keep up regular injections, the interval between injections can slowly lengthen after 2 years as the injected muscles are deconditioned to a more relaxed state. Whenever the effect of the prior botulinum toxin starts to wear off, it would be okay to repeat Botox, Dysport, or Xeomin injection by a trained and experienced clinician injector.
Even though it's less than 3 months after your last Xeomin injection, most of the muscle activities have returned. I am not the dosage that you received but you should be able to have Botox injection now. I like to inject enough dosage to allow for at least 3 months of duration. Best Wishes, Stewart Wang, MD FACS, Wang Plastic Surgery