These health-monitoring tattoos created by MIT researcher Katia Vega change color based on your body's needs.
Vega explores what she calls "beauty technology" -- finding ways to combine cosmetics and electronics to produce smart beauty technology. She's endeavored smart eyelashes, and smart hair extensions, and is now branching into smart tattoos. Vega packs tattoo ink full with biosensors, that measure shifts in interstitial fluid in your skin. The biosensors can change color based on changing levels of glucose, sodium, or PH in one's body, alerting the wearer in a subtle, yet unavoidable way. For someone with diabetes, biosensor tattoos would eliminate the need for daily finger prick tests to check their blood sugar levels as they can monitor the changes in their levels visually.