Hello,
Local
hypersensitivity reaction may occur in some after skin TB test (though rare) in some who previously had BCG
vaccine. The PPD skin test isn’t foolproof. People who received a bacillus Calmette-Guérin (BCG) vaccine against TB may have a false-positive reaction to the PPD test also. Though rare, risk of allergic complications like fever,
redness, rashes, swelling in the arm may be if a person had a previous positive PPD test and had the test again.
Since it is not a foolproof test the doctors have to follow on positive reports with investigations like sputum test, chest X-ray,
CT scan, etc. You can take
Acetaminophen, one SOS for relief. The symptoms should go away gradually in 72 hours, though you can take antihistamine, one SOS to ease discomfort.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician