Ignition key is hot - temp wise

So I've noticed lately that my ignition key is warm/hot to the touch after taking it out of the ignition switch. Is that normal, or is there maybe some carbon buildup etc. inside that's making the normal current that flows through it heat up the lock cylinder? I'm wondering if I need a new switch. I do have some voltage drop on the 12v switched blue wire going to the ballast resistor. Opinions welcomed. Thanks