I have stretchmarks over the majority of my body unfortunately but I got them mainly from pregnancy/GAINING weight....all I have had when ive lost weight in the past is saggy dimply skin
hehe the joys of weightloss!
Kate is right though, maybe you are losing a little fast and your skin cant catch up? Ive heard (but not sure if it is effective or not) that drinking water is supposed to help with skin elasticity etc...personally I have used bio oil on stretchmarks, and it worked a treat
You never really get rid of them but they do fade
sorry I cant be any more help than that