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

It might be that you are reacting to something else.  It could be the saline used to reconstitute the botox, the product used to numb the skin, the product used to sterilize the skin before the injection.  You injector would know what they are using.  I would not assume that you are allergic to botox because this is not what is seen.  Something else is going on.

Thank you for your question and I am sorry to hear of your injection site issues.  As you mentioned having had Botox several times before without issue it is unlikely the Botox itself caused your symptoms.  Perhaps a preservative in the saline used to reconstitute it or a topical ointment that your injector may have applied? I would let your physician know so that a plan to identify the cause can be determined.  Best wishes. 

Probably should be evaluated by a dermatologist and a skin patch test performed to confirm exactly what is the issue.