How long can perlane overfill of cheeks last? Now 13 months and still raised.

I had Perlane injected just under the skin 13 months ago for volume loss to cheeks and mid face. I had an overfill on the left side of upper and inner cheek, which was really raised and went across my upper cheek under my eye. The nurse i went to said she couldn't dissolve as it would take all the filler in my cheek out an said it would only last about 6mths before it started dissolving. Still not all gone.

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