Electronic tattoos

E-tattoos
1)Ultra-thin and conformal: E-tattoos are often less than 100 micrometers thick, allowing them to seamlessly adhere to the skin without causing discomfort or irritation. 2)Biocompatibility: The materials used in e-tattoos are carefully selected to ensure compatibility with the skin and minimize any adverse reactions. 3)Physiological monitoring: E-tattoos are primarily used for continuous, non-invasive monitoring of vital signs, such as heart rate, blood pressure, temperature, and respiration. 4)Transdermal drug delivery: Some e-tattoos are designed to deliver medications through the skin,
https://www.nanowerk.com/nanotechnology-glossary/electronic-tattoo.php

Associate Professor of Bioengineering at the University of California, Todd Coleman, the brain-reading genius behind this project: 'Brain Machine Interface'.
https://www.techradar.com/news/world-of-tech/future-tech/would-you-want-an-electronic-tattoo-that-could-read-your-mind-1148670

Electronic Tattoos are getting traction in Healthcare
https://digitalhealthcentral.com/electronic-tattoos-are-getting-traction-in-healthcare/

E-Tattoos: The cyborg transformation of society. Digital tattoos are on their way to cyborg us and give us superpowers. By monitoring vital signs continuously and discreetly, electronic tattoos are still in their infancy, but their healthcare potential is limitless.
https://digitalhealthcentral.com/what-are-digital-tattoos/

The conductive layers of electronic tattoos can be made using pure conductive materials, like gold or carbon. To attain the flexibility required for these applications, gold is stretched into thin, s-shaped ribbons and carbon is arranged in a two-dimensional hexagonal lattice (carbon arranged in this way is commonly referred to as graphene).
https://builtin.com/hardware/electronic-tattoo