I can report that after 10 days at the seaside, and walking barefoot in the sea and sand pretty much all day long, my feet got cleared and so far (a week later) still haven´t returned. Before the vacation, I had a
huge outbreak. It was simply crazy with multiple bumps and chopped skin. I also suspect that the problem is multifactored, stress being one of them.
I usually went to the seaside once a year for at least 9-10 days and never had those. Then I haven´t been to the seaside for a couple of years and started getting those bumps. Now they´re gone and I´ll monitor if they return...