My leg tattoo got infected, unfortunately. That was a few months ago, and it has healed very well, with only very minimal color loss in a dime-size area. I took pics daily to assess whether things were progressing well, or regressing, and going through them now I thought they showed the healing stages quite well, so I decided to post them in case anyone is curious (or likes gross pictures).
First two are before antibiotics (oral), last set shows progress (left to right) from day 1 to day 9. You can't tell from the pictures but the infection was deep and it felt like a golf ball under the skin.
I suspect the infection was from my dog jumping on me on day 2 or 3, despite all the precautions to prevent it.