some family members just came back from camp. Four out of the eight have what looks like bites on their ankles, arms, a few on the back and one on the back of the neck. Two family members bites look similar, one looks like hives and the other one is completely different. We were thinking bed bugs at first, now we are not sure. Red, raised bumps, very itchy. One of the bites looks like it has a black dot in the middle. Allergies are really wreaking havoc on three of them. They did all go swimming, could this be swimmers itch? or ?