Yesterday I went to get a tb test, a mantoux test, and I have had one previously. I didn't no what to post it in because it seems like an allergy, I dk im sry if I posted it wrong, but anyway...Last year I got the shot, and it was a dot and that was that...It was negative. But this year, I got it yesterday and like 30 hours later its a dark spot with reddness around it and im really worried that it could be tb. I go and get it checked monday but is there anyway to tell or should I be worried that I could have it. Please answer back with any suggestions :? Thanks.