Hello,
Please note that redness is not the indication of whether PPD is positive or negative. Induration (which means hardening of skin and underlying subcutaneous tissue) that is considered positive. Any one that has the bacteria but does not have the disease will most likely be positive for PPD. However, x-ray chest will rule out presence of TB. So, redness is not the issue.
Hello,
Please note that redness is not the indication of whether PPD is positive or negative. Induration (which means hardening of skin and underlying subcutaneous tissue) that is considered positive. Any one that has the bacteria but does not have the disease will most likely be positive for PPD. However, x-ray chest will rule out presence of TB. So, redness is not the issue.