Seroma has stretched the pocket which my buttock implants sit in. How long to heal?

I had seroma 1 year after buttock implant (inside the muscle). The seroma has now been successfully drained, but the area surrounding it has been stretched and the implant can move around. My plastic surgeon said it could take a few months for the muscle to contract around the implant, but I haven't seen much visible improvement. Should I be worried?

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