What is the best treatment for skin tighten on posterior thighs?

I'm in my early 30s and recently had liposuction of my thighs. Even before Lipo I have always dealt with skin issues/cellulite on my posterior upper thighs (right beneath the buttocks). I can't tell if this is a cellulite issue or skin issue. When I pull up the skin right below the buttock, it appears to flatten and smooth out this issue completely. I am wondering if there is a treatment that would help tightening my skin? I also have clear stretch marks here which probably isn't helping the skin.

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