Tuberculin test leads to a focal reaction of capillary dilatation around the lesion and a marked increase in permeability, which can be gradually recovered within 2~5 days in general. Tuberculin test is mainly used as an auxiliary diagnostic basis for diagnosing tuberculosis disease in human body, after tuberculin injection into human body, the reaction is usually observed in 72 hours, the local reaction may appear redness, swelling, nodules, blisters, etc., according to the size of the redness, swelling and hardness, whether there are blisters around the judgment of the existence of a positive or not, to assist in the assessment of whether there is the presence of tuberculosis mycobacterium infection. Tuberculin test can show focal reaction, which means that about a few hours after injection of tuberculin, it may lead to increased permeability around the lesion, manifested as dilation of the surrounding capillaries and congestion around the lesion, which is usually transient, and can be gradually recovered within 2~5 days. The occurrence of tuberculin test lesion reaction, it is recommended to consult the Department of Infectious Diseases of the regular hospital for treatment.