As for what I put on my tattoo, I used bepanthen, which is the nappy rash cream xD
It sounds a bit strange, but a lot of tattooists recommend it, and I know I kept missing the tips of mine, because it's on my back, it's diffficult to reach. The middle is fully healed and the tips are still a little scabby, so the cream has obviously helped some. Only cost me £2.90 for the tube which is so so much more than I needed