I would just tell him you had a doctors appointment, a follow up to a previous visit and they called you back in. What you got was a TB test, not a TB shot. They inject tuberculin just under your skin on your forearm and check the reaction in two days. What kind of reaction - or no reaction at all - determines whether you have been exposed to Tuberculosis. FYI-they give TB shots also known as BCG vaccinations to people, usually babies but sometimes teenagers, in TB endemic countries. It's given in your upper arm but administered simular to the way they give the TB test, in that they inject the bcg vaccine just under the skin and it forms a bubble, later resulting in a small circular scar if the vaccination is successful.
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