Leviticus 13:4-6

4But if the spot on the skin of his body is white and does not appear to be deeper than the skin, and the hair in it has not turned white, the priest will quarantine the stricken person for seven days.

5The priest will then reexamine him on the seventh day. If he sees that the sore remains unchanged and has not spread on the skin, the priest will quarantine him for another seven days.

6The priest will examine him again on the seventh day. If the sore has faded and has not spread on the skin, the priest is to pronounce him clean; it is a scab. The person is to wash his clothes and will become clean.