Leviticus 13:4-6

New Catholic Bible

⁴ But if the spot on his skin is white and is not deeper than the skin and the hair on it has not become white, the priest shall quarantine the person with the sore for seven days. ⁵ On the seventh day the priest shall examine that person again. If he sees that the sore has not changed, and the sore has not spread, he shall quarantine that person for another seven days. ⁶ The priest shall examine that person again on the seventh day. If the sore has darkened, and the sore has not spread, then the priest shall declare that person clean. It was only a scab. He shall wash his clothes and shall be considered to be clean.