Kaur and Khan have published a simulation study demonstrating that a 5G device should cause only minimal temperature variations in the skin layer. For this they use a 4 - layer skin model and the Pennes’ bioheat equation. The comment points out some differences between the 4 layered model they used and those of the groups of Abdulhalim and Feldman, who also incorporated the presence of the human sweat duct in the model. Furthermore, the comment notes that theoretical work by Neufeld and Kuster that takes into account the disparity between the time constants for electromagnetic absorption and thermal perfusion will lead to significantly higher temperature spikes that those found by the authors. Finally, new research by Gultekin and Siegel is noted that does indeed confirm temperature spikes in biological tissues for 5G frequencies.