Quite often skin conditions will go through a period of getting worse before they get better, this could possibly be the case? Myself I never have tried CO for stretch marks as I used Nature's Gift ozonated olive oil (From http://aloeessence.com) and skin brushing. It was amazing the difference just one 2 ounce canister did!! A few are still visible and I am convinced that just one more canister would totally eliminate them. They are now a very light white color, almost skin color and there is no longer that "courdroy" texture to them, but nice and smooth. Mine are older scars too (3yrs), I think it would be even easier to heal newer ones.