Positive or negative PPD test

Patient : I had a PPD implant done on Monday. I had it checked 48 hours later on Wednesday, the results were negative. But five days after the initial implant, and 3 days after it was read, I noticed the injection sight was raised and red, it is not itchy or painful. I measured it, it's diameter is roughly 5mm. Should I return to the doctors, and consider this a delayed positive reaction, or could this just be a antigen independent immune response where my body is riding itself of a foreign substance.
Symptoms:  Raised slightly red bump at injection sight.
Doctor :   This question is currently in queue and will be answered shortly by one of our doctors. In the meantime you may browse our library of answered questions by clicking here.

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