Leviticus 13:9

6 And the priest shall look on him again the seventh day: and behold, [if] the plague [is] somewhat dark, [and] the plague spreadeth not in the skin, the priest shall pronounce him clean: it [is but] a scab: and he shall wash his clothes, and be clean.

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

8 And [if] the priest shall see, that behold, the scab spreadeth in the skin, then the priest shall pronounce him unclean: it [is] a leprosy.

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

10 And the priest shall see [him]: and behold, [if] the rising [is] white in the skin, and it hath turned the hair white, and [there is] raw flesh in the rising;

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

12 And if a leprosy shall break out in the skin, and the leprosy shall cover all the skin of [him that hath] the plague from his head even to his foot, wherever the priest looketh;