Tuberculosis skin test positive chest radiograph normal need to be combined with the actual situation of the patient, follow the doctor’s instructions to use drugs or do not need to take drugs. Tuberculosis skin test positive, but chest X-ray normal, may be because of BCG vaccination, this situation belongs to the normal healthy people; may also be infected with tuberculosis bacilli, in the latent period did not have the disease, need to do further sputum mycobacteria examination, such as sputum smear. 1. Positive tuberculosis skin test, i.e. positive tuberculin test (PPD), may be an immune response after BCG vaccination. After BCG vaccination, the body produces antibodies, which are positive when doing tuberculosis skin test. 2. If you are infected with Mycobacterium tuberculosis, a normal chest X-ray suggests that there are no tuberculosis foci in the lungs, and you may be in the latent period of Mycobacterium tuberculosis infection, without the onset of disease. It is recommended to consult a doctor in time for the abnormal results, and analyze and diagnose the disease with the combination of clinical symptoms and further examination results.