My 16 yr old had a TB test 2 1/2 wks ago and went in and had it checked 48 hrs later, it was negative, but now she has a very small rash where she got the PPD injected. It's not red or round or even smooth. I'm not sure if it is a delayed reaction or even a skin allergy.
More than likely it is just a reaction to the serum, but not a positive result. This is very common but go ahead and call her pediatrician just to be certain. A positive TB will be seen easily in 48 hours. If you have ever seen a positive result, there is no doubt. Usually if something shows up later it is just a kind of inflammatory reaction not a positive TB test. Go ahead and call her Dr though just for reassurance.
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