I've had a double masectomy and used Mederma on the incisions starting 3 days after sugery. Unless you look closely you can barely see the scars. and I scar badly. It is rather expensive, you have to use it 3 times a day but well worth it.
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You can pop and onion in the freezer. After it has frozen solid, remove and let it thaw. (this will help with the onion smell) puree the onion in a food processor, drain the excess water. Apply a thin layer of the puree to the area 3x's a day. Mederma is onion extract and some base oil