It depends on the scar if we can tattoo it or not. If it's still a relatively new scar and raised we can't tattoo it. If it's an older scar/faded a bit, it shouldn't be a huge deal. The problem with tattooing over scar tissue, is that they don't like to take/hold the ink so your tattoo will have blank spots or patchy areas where the scar tissue is if it's relatively new. It can still be tricky getting ink to stay in the old scars too but not as difficult. BTW, I am a tattoo artist so feel free to ask away!