Concerns with temperature

Hello folks I bought a galaxy s4 the screen is very hot and I'm a bit concerned with teneperstures, I checked after some browsing that the temperature was around 67 degres Celsius (not a clue in Fahrenheit's, maybe 130?) I don't really know what to do, after some gaming I literally feel burn pain in my fingers.

Any ideas ? I'm using cyanogen optimised and stable build I have the i9005 s4

Thank you very much