“…Infrared thermal imaging (IRT) is a noncontact, nonradiation, and easy-to-use temperature measurement tool [ 15 ]. It involves temperature measurement and thermal asymmetry analysis of the facial regions of interest (ROIs) and has been widely used for diagnosis and assessment of some facial diseases [ 16 , 17 , 18 , 19 ], such as dry eye [ 20 ], temporomandibular disorders [ 21 , 22 ], chronic migraine [ 23 ], and facial paralysis [ 14 , 24 , 25 ]. Existing studies [ 26 , 27 ] used IRT to measure the temperature difference between the left and right sides of the face of facial paralysis patients; this difference was related to the severity of facial paralysis [ 28 , 29 ].…”