Leviticus 13:8

5 And the priest shall look on him the seventh day; and behold, in his sight, the sore remaineth as it was, the sore hath not spread in the skin, then the priest shall shut him up seven days a second time.

6 And the priest shall look on him again the seventh day, and behold, the sore is become pale and the sore hath not spread in the skin, then the priest shall pronounce him clean; it is a scab; and he shall wash his garments and be clean.

7 But if the scab have spread much in the skin, after that he hath been seen by the priest for his cleansing, he shall be seen by the priest again;

8 and the priest shall look on him, and behold, the scab hath spread in the skin; then the priest shall pronounce him unclean: it is leprosy.

9 When a sore [as] of leprosy is in a man, he shall be brought unto the priest;

10 and the priest shall look on him, and behold, there is a white rising in the skin, and it hath turned the hair white, and a trace of raw flesh is in the rising:

11 it is an old leprosy in the skin of his flesh; and the priest shall pronounce him unclean, and he shall not shut him up, for he is unclean.