Hi jafar.
I know you asked Robert, but this is a pretty general question, so I'll go ahead and answer it. This is not dangerous, this is a result of awareness of your energy body. It is related in that you have learned to feel energy (and feel it), and the tingling is in a normally sensitive part (I assume you meant the sole of your foot?). Keep doing your energy sweeps through the legs and it'll even out- you might have discovered and energy blockage, which is very normal and expected.