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Tuberculin Skin test is done to determine exposure to TB. This test is read within 48-72 hours only. If read later, it is not valid. The reaction is measured based on the size of the induration produced. Induration of skin is raised, hardened area at the injection site. Induration of 5mm or more is considered positive. If they are small bumps, you do not have to worry about them. If very itchy, apply calamine
to soothe skin. Thanks.