system
A chat on subreddit /r/NoStupidQuestions
human
Most float spas keep packets of petroleum jelly handy for this purpose.
gpt
They gave me a little stick of wax to rub on the cut but it's my fault I didn't take it seriously. I put the wax on it but I had no idea how bad the salt would sting. It was a tiny cut, like a paper cut, so that's why I'm putting the warning out there: do not bathe in a heavy salt solution, such as an isolation tank, with any kind of open cut.