What procedure can flatten these two tiny scars left behind from my Appendectomy? (photo)

I had my appendix taken out when I was 9 years old and now I'm 18 years old and am tired of the tiny scars left behind from it. They were 3 tiny scars but only 2 of them have indents in them. Luckily the 3rd one healed flatly and is not noticeable. The scar above My belly button and The one on my lower stomach cause a small bulge on my stomach. Even though they're tiny they make me feel self conscious. What can be done to flatten them?

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