Respected Sir/Ma'am, Can mantoux test come positive without injecting purified protein derivative?? I mean, I got tested for mantoux in July 2018 and day before yesterday I noticed redness in my forearm,there was no itching, no history of insect bite, it persisted for about 2 days and went off. I don't remember exactly whether left or right hand was used for the test. Kindly help. Thanking you