I see you have Haas on your list of schools. For what it's worth, I do recall reading a blog post somewhere about one guy's visit experience to Haas and he was saying how laid back and relaxed the students seemed and he mentioned one specific Haas student who had piercings and tattoos and i THINK wearing a tanktop
This is only from memory but I do recall it was very similar to that
That said, as progressive as I am, or like to think I am, I don't think it's really worth the risk for you to mention your tattoo. As the fellow poster said you really have no idea who reads this and ultimately these are people with their own value and look on things so might not be so keen on the tattoo
On the other hand they might have a monthly subscription to "Ink Stink" tattoo magazine or something, in which case you score
But odds are that isn't the case. So even though I encourage risk taking in somethings, in this particular one I don't think you have such an upside, again like a fellow poster said, best case is that it doesn't necessarily show that much commitment, for you personally you know it does and why you got it, but a lof of people get tattoos on a whim or when intoxicated
Whichever way you go, go all out, if you decide to mention it give it it's full
Cheers