Can I apply for a health certificate if I have skin diseases? I want to apply for a health certificate at KFC.

Yes, it is easy to apply for a health certificate. Just take a blood sample, mainly to see if there is liver disease, and make a chest X-ray. It should be to see infectious diseases such as tuberculosis. By the way, it is also important to test stool, but all you have to do is give the doctor an empty box. They don't ask, the small box itself is provided during the hospital inspection. This is the case with health certificates every year.