I used to kind of agree with Gnosis, but I am not as sure any more. I think pretty small is good, and in a place where you can choose invisible, or not. I'd stay away from skulls, though!
My tbx got one around her ankle recently, I kind of like that.
Na, not allergies. I actually think that I've been in some hyper-immune state all these months and now that I am less stressed, it is hitting me...don't know if that makes sense. I'm a health nut so I know what to do...can usually nip these things pretty fast.