What is bruise from tb test?

A bruise from a TB test is a common side effect or reaction that can occur after undergoing a Mantoux skin test, also known as a tuberculin skin test. This test helps determine whether an individual has been infected with tuberculosis bacteria by injecting a small amount of a purified protein derivative (PPD) under the skin of the forearm.

The PPD protein elicits an immune response in the body, causing redness and swelling at the site of injection. In some cases, a bruise may appear surrounding the injection site due to bleeding beneath the skin.

Bruising is a common and expected side effect of a Mantoux test and is not a cause for concern. A bruise may take several days to heal and can be managed by applying a cold compress to the area or taking an over-the-counter pain reliever. It is important to note that a bruise does not affect the accuracy of the test results.

Individuals who are concerned about the severity of their bruising or experience other symptoms, such as fever or an allergic reaction, should consult a healthcare provider immediately.