Mantoux Test - a small amount of testing material is placed just below the top layers of skin, then two days later a health care worker checks the arm to see if a bump has developed

http://www.immunologyclinic.com/jpg/300_96dpi/HH10_300.jpg

http://www.stanford.edu/class/humbio103/ParaSites2006/TB_Diagnosis/102_tuberculin_wheal.jpg