Off topic, so feel free to downvote, but I have a possibly related question that may find some answers here. I generally have a dry scalp, and dry skin around

Off topic, so feel free to downvote, but I have a possibly related question that may find some answers here. I generally have a dry scalp, and dry skin around eye brows and beard. I started swimming about five months back and these drastically improved. I cracked a couple of ribs in a cycling accident and had to stop... the problems returned. Back swimming again now and they're gone again. The only info I can find online is of people complaining that pool swimming _causes_ dry scalp problems but I seem to be experiencing the opposite. Any reasons why this might be the case?