Current seems to be flowing through light switch
Okay, so an issue that confuses me somewhat. This is happening with four electrical fittings, it's two metal light switches on the outside of my bathroom wall, and the two metal electric razor sockets inside the bathroom. They're new fittings, installed about 9 months ago with the bathroom installation. Similar fittings mere feet away don't exhibit any such issue.
When I touch the casing (hands bone-dry) I can feel a slightly painful prickling, kinda like the feeling you get with a static shock, but persistent rather than one-off. The funny thing is that I only feel this when I touch it with skin that has hairs on it (so I feel nothing with my fingertips, but the back of my finger will immediately pick up the sensation).
Considering the rather minor pain (and the fact that I'm posting on reddit rather than drooling in a hospital bed), I'd assume there can't be a live wire touching the casing. Can anyone enlighten me on what's happening and what, if anything, I should do about it?