Leviticus 13:30-34

³⁰then the priest shall look on the plague, and, behold, if the appearance of it be beneath the skin, and in it there be thin yellowish hair, then the priest shall pronounce him unclean: it is a scurf, it is a leprosy of the head or a leprosy of the beard.

³¹And if the priest should see the plague of the scurf, and, behold, the appearance of it be not beneath the skin, and there is no yellowish hair in it, then the priest shall set apart him that has the plague of the scurf seven days.

³²And the priest shall look at the plague on the seventh day; and, behold, if the scurf be not spread, and there be no yellowish hair on it, and the appearance of the scurf is not hollow under the skin;

³³then the skin shall be shaven, but the scurf shall not be shaven; and the priest shall set aside the person having the scurf the second time for seven days.

³⁴And the priest shall see the scurf on the seventh day; and, behold, if the scurf is not spread in the skin after the man's being shaved, and the appearance of the scurf is not hollow beneath the skin, then the priest shall pronounce him clean; and he shall wash his garments, and be clean.