it sounds like heat rash - probably due to a ventilation issue I'm guessing? You might try something like Vit AD ointment, it's clearer and great for diaper rash and it may not interfere with the electrodes since they use something like for those heart thingys right?
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"