I like tattoos, but this was just for fun, so I don't need it anymore. And Geralt is not that type, who should be covered with them to be more beautiful ..
Green mold, wolf's aloe, and white myrtle petals. Green mold and wolf's aloe can be bought from any alchemist, white myrtle petals grow practically everywhere. Tattoo is removed either by Triss (Ch.1), Sile (Ch.2 Roche's path), or Philipa (Ch.2 Iorveth's path).
Well I accidentally removed the tattoo this weekend. Apparently I had the ingredients, and I was going through the chat options with Sile, and didn't pay enough attention to what I was doing, just wanted to make sure I got everything possible put in my Journal, so I went through it fast without listening/reading. ah well.