Am I positive or negative for TB?

TB tests are measured by the area of induration (a raised hardened area that can be felt when you touch it) although a blistered area is considered positive as well. If you're healthy, an area of induration that is more than 15mm is considered a positive test. It's hard to tell by looking at your pics and not being able to "feel" your testing site if you have any induration or not. It looks like just redness which, by itself, is not considered to mean your test is positive. You should be going back to have the test read a few days after the injection.