The difference between concealer and foundation is that concealer is usually has a thicker consistency. With any concealer that you use, just be mindful that from a distance of a meter or more, no one will be able to tell you are wearing makeup, but any closer than that, it will be noticeable. Especially to women because we know what to look for!

If you dont mind that, then go for it with concealer, but i would suggest that you try a few. Everyone's skin is different and reacts differently to different brands.
Another more natural cover you may want to consider is a tinted moisturiser. This is a moisturiser with a tiny tint through it. Its not going to cover your scars like concealer, but it will even up your complexion as a whole, and give a more natural 'non makeup' look.
Good luck with it all....Its so much easier for us women as we can happily wear makeup and cover the horror that is acne.