Leviticus 13:32-34

32On the seventh day the priest will examine the disease. If the scab has not spread, there is no yellow hair on it, and the scab does not look deeper than the rest of the skin,

33the person will shave everything except the scab. The priest will put the person with the scab in isolation for another seven days.

34On the seventh day the priest will examine the scab again. If the scab has not spread on the skin and does not look deeper than the rest of the skin, the priest must declare him clean. When he has washed his clothes, he will be clean.