TB skin test means PPD test, after doing PPD test, local redness and swelling of the skin is a normal reaction, do not need to worry too much, do not use soapy water to wash, do not scratch, eat a light diet, less chili peppers and other stimulating foods, the local redness and swelling will slowly subside. redness and swelling of the PPD test suggests that it is positive or strong positive. If it is positive, it suggests that you have been infected with Mycobacterium tuberculosis or vaccinated with BCG. If it is strong positive, consider the possibility of active tuberculosis, both cases need to further improve the chest X-ray and other related examinations, to rule out the possibility of tuberculosis infection.