Fig. 1.

A) Illustration of the oxygen-sensing paint-on bandage applied to skin as a liquid, drying into a solid thin film, and the application of the barrier layer. B) Top: bandage applied to healthy skin; bottom: bandage applied to inflamed skin with perivascular infiltrating lymphocytes actively consuming oxygen. C) Upon application, bandage pO₂ equilibrates with the tissue underneath: higher equilibrium pO₂ and a slower initial equilibration rate when applied to healthy skin; lower equilibrium pO₂ and a faster initial equilibration rate when applied to inflamed skin.