Filler side effects
Yes, it is best to have an in-person exam, and to know more details about your treatment to answer your questions. Hyaluronidase may be used to dissolve a hyaluronic acid filler as needed even as soon as the same day or even a year later. It is unusual to develop fever within the first few days of treatment unless there is a very large bruise which may sometimes trigger inflammation and fever. True bacterial infection usually take more days to develop. Swelling is common in the first two-four weeks after most filler treatments..
Problems with fillers
In order to answer this properly, we need to know what kind of filler you had injected. Fillers like Restylane and Juvederm can be dissolved with hyaluronidase. Other fillers can't be dissolved. So, what did you have injected and can you post photos?
"This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."