you will not spead ringworm (a fungal infection) through a swimming pool. while it can be spread through direct contact with others who may be susceptible just cover it with that waterproof bandaid so you don't have to explain it. hopefully you are treating it so it should be resolving in a few weeks to a month.
when is ringworm no longer contagious when swimming in a chlorinated pool? do waterproof bandaids prevent the spread?