Medicine & Tattoos

Odd random thought: medicalert tatoos would be infinitely more practical than medicalert bracelets or necklaces.  People would always have them on, and there would only be a single version... any updates would just involve adding things or covering up other things.

I know, probably too sci-fi dystopia or mark of the beast or somehow reminiscent of the Holocaust for people to accept.  Still, I'm reasonably sure it would save at least a few lives.

If I ever get diagnosed as allergic to any kind of drug or other substance, it's going on a tatoo.  Just in case.