Leviticus 13:9

7But if the scab spreads on the skin after he has shown himself to the priest for his cleansing, he shall show himself to the priest again.

8The priest shall examine him; and behold, if the scab has spread on the skin, then the priest shall pronounce him unclean. It is leprosy.

9“When the plague of leprosy is in a man, then he shall be brought to the priest;

10and the priest shall examine him. Behold, if there is a white swelling in the skin, and it has turned the hair white, and there is raw flesh in the swelling,

11it is a chronic leprosy in the skin of his body, and the priest shall pronounce him unclean. He shall not isolate him, for he is already unclean.