I really think it's down to genetics. My heaviest weight was just under 19st, but for the last 15 years have gone between 10.5 and 16.5 st. This surgery has seen me go from 14.5 to 10.9 and my skin is dreadful. Mostly my arms, bottom and thighs. I'm due to have my arms done in the autumn as this affects me most. As an indicator to genetics, I was one of those that had horrendous stretch marks as a teenager and during pregnancy, so honestly believe my skin just wasn't up to much in the first place.