Idenify the infection disease

Leviticus 13:1-28
Infection disease: the hair in the sore has turned white and the sore appears to be more than skin deep. if turned white but does not appear to be more than skin deep, the priest is to put the infected person in isolation for 7 days or more 7 days to examine him. 發炎不會感染，細菌型皮膚必須傷口對傷口才會感染。If there is raw flesh in the swelling, it is a chronic skin disease大痳風and the priest shall pronounce him unclean.
The raw flesh is unclean; he has an infectious disease, if the sores have turned white, the priest shall pronounce the infected person clean.
Boil on his skin and it heals, and in the place where the boil was a white selling or reddish-white spot appears. The Priest is to examine it, it appears to be more than skin deep and the hair in it has turned white, it is unclean.

Although the word 'leprosy' is used throughout in many versions, true leprosy is only one of the skin diseases mentioned here. Here is written in technical jargon(行話) - a professional textbook on diagnosis for the priest-physician, enabling him to distinguish between 'acute' and 'chronic' forms of the various diseases. This is the earliest formulation of quarantine regulations and preventive medicine relating to these diseases so far recovered from the ancient Near East.
Why?
Distinguish the true disease of skin or not is a technician. Let the disease do not spread in the camp of Israelite.
How?
Keep us living in clean environment and keep away eat or touch unclean matter.