Both of those need to be contracted from someone else I'm pretty sure. So unless someone else was wearing your booties, I don't see how this could happen.
Mabye it floated in the water and attached to your bootie. A ringworm superbug. You should call the CDC my friend.
Never heard of that happening. You go to the gym? I used to get weird skin ailments from the mats when I trained Jujitsu...nasty ase of ringworm(that I passed on to my ex, she wasn't happy), also warts on my hands that were a bit@H to get off. Never thought any of that stuff would survive in salt water.