Leviticus 13:4-6

4But if the irritated area is white and does not look deeper than the rest of the skin, and the hair has not turned white, the priest must put him in isolation for seven days.

5On the seventh day the priest will examine him again. If the disease looks the same and has not spread, the priest must put him in isolation for another seven days.

6On the seventh day the priest will examine him again. If the diseased area has faded and not spread, the priest must declare him clean. It is only a rash. The person must wash his clothes and will be clean.