I do remember getting very itchy on one dive, i can only assume it was sea lice - the conditions were very silty and the vis very low, i'm not sure if that had something to do with it. during the surface interval i rinsed off with fresh water on the boat and stuck the hose down the back of my wet suit to flush out any thing on the inside, the second dive, I wasn't that itchy, but we were also in a less silty area