It is common to have swelling after Juvederm injections. When that happens, it seems like too much was injected. This swelling tends to go away over one to two weeks.
The "blister" inside of your lip could be a bruise or some extra Juvederm. It is also important to check and be sure that you are not getting a fever blister. I would have your cosmetic surgeon take a look at it to be sure.
If after all is said and done you want to get rid of the Juvederm an injection of Hyaluronidase will dissolve it completely in less than one day. All that would be left is any bruising, which usually goes away over a week or two.
Hope this helps.


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