Epidermal electronic tattoos (ultra-thin, conformal circuits printed on temporary/transfer substrates) have matured into battery-free NFC/near-field devices that can store small data, run passive sensors, or authenticate identity. Labs have demonstrated stretchable NFC tattoos with LEDs and biosensing electrodes; commercial interest ranges from authenticated event access (tattoo as wristband replacement) to medically relevant ID tags for chronic-condition notes. Important privacy and ethics questions arise if skin-embedded IDs are used for authentication — the technology is powerful but requires tight consumer protections.
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