Having swelling 4 days after BOTOX is extremely unusual. First of all, I would not recommend a GP to inject BOTOX. There is a reason there are medical specialities because one cannot be an expert at everything. If I had a kidney infection I wouldn't see a cardiologist. You deserve the highest level of care for yourself and you should see the appropriate physician for your cosmetic needs.
You may have developed a small hematoma where the needle was placed. If so this should resolve with time. I do not inject patients who are on blood thinning medications. Also it is important to inject BOTOX at different levels according to the location you are injecting. Too deep or superficial an injection can lead to less then ideal outcomes. That being said, you probably will be fine, but I would go back and see your GP.
