Objective We investigated the effects of NPPV mask placement on the skin by observing skin temperature changes on thermal imaging.Methods Eight healthy subjects were required to wear a NPPV mask for 1 h. Visual examination and thermal imaging of the facial area were performed before and after fitting the NPPV mask. Skin temperature at sites where the skin came in contact with the NPPV mask was calculated by thermographic analysis, and the relationship between skin changes and skin temperature was investigated.Results Skin changes occurred in all subjects in the form of reactive hyperemia at the forehead and nasal root. Median value change in skin temperature after fitting the NPPV mask was +0.43 degree at the forehead, and -0.15 degree at the nasal.Conclusion Reactive hyperemia was observed at the forehead and nasal, but skin temperature at the nasal root actually decreased, suggesting reduced blood flow to the skin.
