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A member asked:
I got a tb skin test a week ago and i still have a red bump on my arm. they told me it was negative. i was wondering if this is normal?
A doctor has provided 1 answer
Not unusual: You did go through a process where your skin was pierced producing a minor injury. Healing time afterwards varies with the individual. The positive/negative readout is based on the size of thickening/redness at the time it is read.
Answered 12/10/2018
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