I was in the ocean for roughly an hour today. I put on swimming trunks and noticed nothing on my penis. I kayaked for 15 minutes and began venturing a small island. During my venture I was feeling slight discomfort in my groin but thought nothing of it. When I was done and came back to my room to shower I noticed small dark red bumps on my penile head. These bumps are sensitive to touch and clothing. It has only slightly hurt once when I urinated originally. The swimming trunks I wore were too small as well which caused a lot of rubbing while I was out.. (I am sexually active with one partner but this has never occurred.)