Leviticus 13:6-8

New Catholic Bible

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. ⁷ But if the scab spreads after the priest has examined him and declared him to be clean, then he must be examined by the priest again. ⁸ The priest shall examine it, and if the sore has spread, the priest shall pronounce him to be unclean for it is leprosy.