I have been getting Botox and most recently Dysport for4 years. In the past couple of years, it rarely works. I thought it was injection technique, so I switched providers (have seen 4 different providers now). I have also, after failure, had it completely redone 2 weeks later with way more units-no luck. I get a reaction when it doesn’t work- my face develops hard knots that last 2-3 days. Sometimes itchy. I think that I might be allergic to a preservative? Thoughts? Or just immune?
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