Thigh Liposuction Vs. Thigh Lift

I want to get plastic surgery to improve/reduce my thighs, and I'm having trouble figuring out whether I need liposuction or a thigh lift. My thighs are large (larger than what would be expected for someone of my size), but they aren't smooth. On the inner thighs (the area I want done), there is some wrinkling that almost gives the appearance of sagging. I'd assumed it was fat, because I thought excess skin could only be caused by a large weight loss, which I haven't had. Is this true? I'm in my early 20's and wondering what type of procedure I should seek.