I would see a doctor for this and make sure there is no issue with blood flow

When I dyed my hair black I really liked the Garnier 100% color in blue/black. The black barely faded, many of the other in store brands tended to fade rather quickly.

You might be able to make a homemade tattoo gun, but without the proper knowledge of depth, sanitation, inks, you can do some serious damage. Please don't be a scratcher... Go to a reputable artist, or you risk turning your skin to hamburger or severe infections. www.checkoutmyink.com