Why does my ab skin look bad after tummy tuck? It's been 11 months. Skin looks pulled and pleated? (photo)

What can I do to fix this poor skin condition. I had tummy tuck 11 months ago. I am bigger and weigh more than before tt. I have never been overweight in my life but just fixed muscle separation I had. I usually weigh 125lbs and now 137lbs and can't lose weight. I'm just wondering what could be the problem. Has the surgery affected how my body burns fat? Eliminates wastes? I just want to understand and try to fix it