Returned from a beautiful stay at Emerald Isle over a week ago. The last evening we were there, we found that our oldest child was covered with bites all over her back and chest and a few on her arms. She had been wearing a longsleeve swim shirt and playing in sand and water all week. After googling I've found they are probably "sand fleas" or "noseeums"? None of our other kids (who were all rolling in the sand even more) got any bites. They don't seem too itchy most of the time but they still haven't gone away. Has anyone else experienced this? Any tips to get them to go away faster?