Because the energy level of violet laser stimulation was relatively high (in kJ/cm2 range), tissue heating was induced, as was previously described by our group. In that report thermal imaging demonstrated that at a distance of 1 mm from the tip of the violet laser needle tissue temperature increased by 2.6℃. The present study results are relevant insofar as a generally accepted proof for the existence of meridians using thermal imaging cannot be assumed to exist. Whether thermal imaging can contribute to this still open-ended question is controversial [14-17].