Small amounts of alcohol generally have little effect on the results of the TB skin test; large amounts of alcohol may cause redness of the skin and a rash that can interfere with the interpretation of the skin test results. The tuberculosis skin test, also known as the PPD test, involves injecting a small amount of tuberculin into a weak area of skin on the forearm of the body and determining the results by observing the response at 24, 48 and 72 hours. The tuberculin test aids in the diagnosis of a tuberculosis infection. The results of the tuberculin skin test need to be determined by a medical professional. Small amounts of alcohol do not usually cause a significant skin reaction, so it does not affect the tuberculin results. In patients who drink a lot of alcohol, the alcohol in the body can accelerate blood circulation, and the human body can show redness of the skin, and some even itchy and other conditions, which may affect the results of the skin tuberculin judgment.