Yet more tattoos, I’m afraid.
Today’s invention is effectively a networked, handheld device containing a bank of ink-fed needles, driven by a printer-like mechanism.
This gets strapped securely to the individual interested in body adornment -who can then select from a huge number of available patterns online. They would be able to modify wording/colours etc on-screen before committing to being marked (I’d suggest mandatory spell-checking).
This could be adapted to simply draw on the skin, using long-lasting, but removable, inks.