Sudden Inflammation and Pain--5 years Post-Op Abdominalplasty, is this normal?

I had an abdominalplasty 2012. Now suddenly, for about a month, I've had significant swelling and pain all throughout the entire surgical flap area, incisionl, vertical muscles are very painful, and flanks sore where liposuction was done. The swelling and pain are so bad that I feel like I just had surgery and can barely do anything without pain and further swelling. GP did bloodwork including ANA normal. PS has no idea what is wrong. I started prednisone today. What could this be?