Where are you? If you can get hold of the Australian product Lucas' Papaw Ointment, then that's absolutely brilliant for scar reduction.
Vitamin E is also really good topically, as is rose hip oil and coconut oil. Trilogy (a New Zealand brand, available around the world) do very good Rose-Hip Oil products which I've had a lot of success with.
I would avoid anything with any kind of petrol-chemical or petroleum though - they're usually fairly carcinogenic for a start, but also because they form a kind of coating on the skin which seals the moisture in and doesn't let it breathe, which leads to other skin problems like blocked pores or a dependence on them to keep skin moist. Besides that, they're also reactive so not good for sensitive skin.
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