if something is biting me, i should be able to find it and kill it. if i'm allergic to something, it should go away when the allergen is removed. i'm more concerned about bacteria or mites, although i see no evidence of the latter.
i'm going to start wiping my body down with disinfectant wipes 2-3x a day and see what effect it has. i'd expect that ought to kill any bacteria or fungus and severely harm any mite or tick.
if it doesn't go away in a few more days, i'm going to have to get to a clinic to figure out what it is.