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A 21-year-old female asked:

took a tb test last monday & the nurse said it was negative on wednesday but now i have a red spot should i worry?

2 doctor answers3 doctors weighed in
Dr. Nestor Del rosario
Addiction Medicine 34 years experience
Not reversible: It is common for people to have some allergy to the components of the test medicine. The reaction for positive test is specifically the bump felt and not the redness. It will go away.
Dr. Gregory Patrick
Pulmonology 45 years experience
Don't worry: A TB skin test is read at 48 hours. If it was read as negative it means that you do not have TB infection. I do not know what the red spot means.

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Last updated Jun 10, 2014

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