http://www.niioc.nl/products.htm
Those guys (in Holland) will happilly insert jewlery into the white of your eye.
No. Your skin is very good at protecting you know… everything inside of it, so hot water hitting your skin won’t do anything. Now, if you scrub your skin with a metal brillo pad until you take of several layers of skin, yeah the water might do something but so would the scrubbing.
Once healed the design is locked in. UV rays can do damage because they can penetrate and hit the ink blobs and break them up causing blurring (which is why old sailors have shitty blurred bluish green tattoos on their forearms).