Rosehip is great for scars however it's not suitable if your skin is has active acne, pimples or overt oiliness as it can cause the skin to break out even more. You'd be fine if your skin is normal, dry or even combination and the pimples are a one off and no new ones are coming up frequently but I'd stay clear otherwise.

For that type of scarring you could look at gentle skin lighteners and exfoliants.