this post was submitted on 17 Oct 2026
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TB doesnt cause the scar like that. the tuberculin test causes a swelling, to determine if you have been infected with TB, or if you are a foreigner who had BCG vaccine.
No. BCG scar, which was developed as a TB vaccine. It is only efficacious in some forms of infant TB, though.
Smallpox innoculation scars are smaller, among other things.
Source, tb vaccine research career.
BCG definitely did leave a scar. We all had to get vaccinated again (the entire school) when my GCSE art teacher got TB and coughed all over everyone instead of staying at home. I had the skin test that showed I already had immunity, when most of the others had to have the BCG. I remember the nurse making me go behind a screen to take off my shirt so she could check for my BCG scar.
I don't have the scar anymore. But it was there during my younger years.
Oof. The skin test is not reliable. Either is revaccinating. But, they didn't have good data on either for a long time. Not fun.
I wouldn't say they are smaller, but they look different. I'm not an expert, but I'd say the two upper scars are from the two mandatory smallpox vaccinations and the lower from the (likely also mandatory) bcg injection.