Leviticus 13:29-33

29“When a man or woman has a disease on the head or in the beard (face),

30the priest shall examine the diseased place; if it appears to be deeper than the skin, with yellow, thin hair in it, the priest shall pronounce him unclean; it is a scale, it is leprosy of the head or beard.

31But if the priest examines the spot infected by the scale, and it does not appear deeper than the skin and there is no black hair in it, the priest shall isolate the person with the scaly infection for seven days.

32On the seventh day the priest shall examine the diseased spot; if the scale has not spread and has no yellow hair in it, and the scale does not look deeper than the skin,

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