Thanks for your interesting question. I would say there are following important possibilities for your symptoms and these are like infection which is resistant to current antibiotics, hypersensitivity reaction to restylane sub q filler. I would strongly advise you to have these tests done like blood culture, complete blood count. Blood culture and sensitivity should be done and then antibiotic should be given if there is any element of infection found. I will also suggest you to see Internist for complete evaluation.
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Dr. Amir Javed