I had Mantoux test done on December 19th my exchange program suggested it. I don’t have any symptoms of tuberculosis so the reading had to be done but i though i could skip it because the hand didin’t hurt at all and it had some redness around it but i didin’t think much of it and today is December 24th and the spot seems to be bigger(probably just didin’t notice how big it was) but some sites say you shouldn’t measure the redness, but if i do its around 9mm, what should i do?