Leviticus 13:29-33

29“When a man or a woman has an infection on the head or in the beard,

30the priest is to examine the infection, and if it appears to be deeper than the skin and the hair in it is reddish yellow and thin, then the priest is to pronounce the person unclean. It is scall, a disease of the head or the beard.

31But if the priest examines the scall infection and it does not appear to be deeper than the skin, and there is no black hair in it, then the priest is to quarantine the person with the scall infection for seven days.

32The priest must then examine the infection on the seventh day, and if the scall has not spread, there is no reddish yellow hair in it, and the scall does not appear to be deeper than the skin,

33then the individual is to shave himself, but he must not shave the area affected by the scall, and the priest is to quarantine the person with the scall for another seven days.