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I would report this to the injecting physician to rule out possible infection. An allergic reaction is possible but highly unlikely.
What do to about redness at Botox injection sites depends on how long ago your treatment was. If it was an hour ago or even yesterday, I would not worry yet. If it is several days or a week and getting red, inflamed or tender then it's possible that you have something more serious going on. Call your physician and set up an appointment to review if it's the latter.
It is very common, and expected, to have a very tiny red bump for several hours to even a day after the botox injection, but if it persists thereafter, it probably is a small bruise that will go away in two weeks. Infections are extraordinarily rare after botox injections, and should they occur, they would not be present immediately after the injection but there would probably be a delay of a few days before its onset. If there is pain, especially without touching the area, and redness then infection may be present and you should call your doctor. Bruises are red or purple and some will hurt when touched.
If you are referring to the redness right after treatment, this is pretty normal and fades within hours. If you are talking about redness days after a BOTOX treatment, it could represent a cellulitis. This is fortunately rare but warrants a call to your doctor. If you do have a cellulitis, in addition to redness you will also have pain. and warmth. Treatment is usually warm compresses and antibiotics.
Usually any redness is from the needle and gets better soon after the injection is complete.