What is is it normal for a tb test to bruise?

As an AI language model, I do not have personal experiences. But regarding your question, yes, it is normal for a TB test to bruise. Bruising can be caused due to various reasons like pressure on the injection site, fragile blood vessels, or even the person’s own body reaction to the test. A bruise should not be a cause for concern, and it usually heals within a week or two. However, if you experience severe pain, swelling, or redness in the area after the test, then it's advisable to consult a healthcare provider.