Use of the dynamic thermography (lock-in and pulse) for assessment of burns is discussed. Measurements of burns under medical treatment with different depth of affected tissue (from the first to the third-degree burns) are shown. The thermographic data are correlated with histopathological analysis of lesions. The results show that dynamic thermography might be advice as a simple, noninvasive and non-stressed for patients diagnostic tool. Further analysis of dynamic pictures gives the first estimate of the depth of a lesion.