Near the middle of Harvard Square, Chameleon Tattoos and Piercings is located in the upstairs of a Ben and Jerry's location. Convenient college kid location, but also very reputable tattoo artists. 3 of my friends have also gotten piercings there that have never gotten infected. Staff members always make sure to tell you care instructions to properly take care of your tattoo and/or piercing. Friendly staff, besides the person at the check-in counter. However, they are often busy on the weekends, so I would also suggest Pino Bros Ink in Cambridge as well.