since several months, I often go to the gym to make my
workout. Therefore, my hands and arms are often exposed to the
machines that everyone uses there. And on my hands, sometimes, I have little blisters or cuts (which don't bleed, however); I had large sunburns on by arms (which were partially healed, because the skin was not red anymore and not sore at all).
I recently read that gyms were "dirty" places with lots of germs.