A brightening serum will help fade any red marks / scaring but I don’t know if there’s really anything you can do to prevent it as some kind types are more prone to scaring then others.

I found Bio Oil was really good for reducing the appears of scars and any redness.

There is no real preventive measure except deal with the acne, it starts in your liver, all skin problems start from there, so eat healthy, cut out the junk and lower your fat intake.Drink lemon juice every morning too. Try using aloe vera gel or pawpaw cream. Search the internet too.