Leviticus 13:29-33

29“Now if a man or woman has an infection on the head or on the beard,

30then the priest shall look at the infection, and if it appears to be deeper than the skin and there is thin yellowish hair in it, then the priest shall pronounce him unclean; it is a scale, it is leprosy of the head or of the beard.

31But if the priest looks at the infection of the scale, and indeed, it appears to be no deeper than the skin and there is no black hair in it, then the priest shall 1isolate the person with the scaly infection for seven days.

32And on the seventh day the priest shall look at the infection, and if the scale has not spread and no yellowish hair has 2grown in it, and the appearance of the scale is no deeper than the skin,

33then he shall shave himself, but he shall not shave the scale; and the priest shall 3isolate the person with the scale for seven more days.