My fiancee and I went catfish-ing late last night and we were standing in a shallow, mossy, small pool of water where a small stream connects to the ohio river. he was wearing shoes, but i on the other hand was wearing flip flops. today i had been itching all over but didn't really put it together until i started paying attention the areas i was itching, there are teenie tiny small black lines, that are sometimes round that are biting and burrowing all over. what are they? and how do u get rid of them? (besides a shower...i've scrubbed all over)