There is no need to avoid eating after PPD skin test. You must not eat spicy food unless you are sure that you have tuberculosis.
Living habits are basically living and bathing, and they are not affected by anything. Don't touch PPD skin test (don't rub it when it hurts, don't scratch it when it itches), that is, it is best not to rub or scratch it around. Just rinse it with water when taking a bath, and don't wipe it hard with a bath towel. So as not to affect the result.
The 48-hour PPD skin test can basically determine the results. The diameter of the mass is negative within 5 mm; Positive within 5-20mm; More than 20 mm strong positive.
Negative indicates that there is no infection or tuberculosis in the body; Positive is that the body carries tuberculosis but has antibodies; Strong positive is an active tuberculosis focus in vivo, which needs further investigation.