Leviticus 13:7-9

Amplified Bible

⁷ “But if the scab spreads farther on the skin after he has shown himself to the priest for his [ceremonial] cleansing, he shall show himself to the priest again. ⁸ The priest shall look, and if the scab has spread on the skin, then he shall pronounce him unclean; it is leprosy.

⁹ “When a leprous infection is on a person, he shall be brought to the priest.