Let me first begin with the disclaimer that tech companies apply for patents all the time. Some—probably most—of those patents never come to the market. So this is just a crazy idea at the moment, and is not something you'll be seeing out in public anytime soon. But, still:

...Motorola has applied for a patent of a microphone with a tranceiver and power supply that is designed to be tattooed onto your throat. The idea is to capture vibrations directly from your larynx in order to cut out background noise — while eliminating something else you could lose, we imagine.

I don't expect these to take off immediately, but I imagine at some point in the future, these sorts of tattoos will be commonplace.