Allergic to botox: swelling, burning, itching at/around injection sites. Does this mean I can't use Botox again?

It is highly unlikely that you are allergic to Botox. It had to be something else that injection site came in contact with such as numbing cream, sterilization product or something used after the injection. I advise you to contact your provider and determine what caused the allergy. Good luck! 

Thanks for your question and it is important to note that true allergy to Botox or any of the toxins is very, very rare and I doubt that whatever happened in your case is an allergy to the product, more likely something that happened during the injection process or afterwards.  These injections should always be given in the offices of a board certified dermatologist or plastic surgeon and if there are any questions or concerns, we are always available to discuss and to hopefully handle things without much concern.  Find the right provider and you should do fine.