I had a heart defect upon birth which had to be dealt immediately with heart surgery; otherwise, I wouldn't have been able to grow any part of my body. So, when I was six months old, My parents traveled five or so miles to San Francisco to fix the problem I had, and I've had this scar on my chest all my life. There's a nine or so inch vertical scar from the middle of my chest area upwards, and three dimples that were there from ventilation tubes that went into my body in case anything needed to leak out.
It's actually kind of neat, but the dimples make my skin oddly formed, which is the best way I can describe it without posting pictures.
Other than that, no scars. Just one huge thing on my chest.