Stretch Marks and Cocoa Butter

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So I've been using the Palmer's Cocoa Butter for stretch marks but it doesnt seem to be helping all too much. My stomach doesnt have any at all, but everyday i have new stretch marks on my boobs. I use it 3× a day like directed. It looked like it was helping to lighten the ones on my left boob, but now they look darker. Does anyone have any positive experiences with the Cocoa Butter?