Fickle body fat

I made this thread a while ago, but I didn't really get much productive out of it.

For some reason I have really fat legs, especially in the thighs. The wierd thing is, the rest of my body is pretty lean. It'd make more sense if I was fat everywhere...

I don't work out often and I don't have an immaculate diet, but I can't think of a logical reason for this. I'm thinking it's genetic, but I'm wondering if there's some sort of solution for this.

Anybody know anything that can help?