Interesting question. I don’t know what the effect of accelerating the healing of a tattoo would be on the appearance of the tattoo. I think Michelle’s ideas are good. But, as I said, I don’t know how it would affect the image.
If it’s just the pain (rather than the healing) I’d probably spray some hops tincture on it.
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.