Leviticus 13:12

13:12 If, however, the disease breaks out on the skin so that the disease covers all the skin of the person with the infection from his head to his feet, as far as the priest can see,

Leviticus 13:37

13:37 If, as far as the priest can see, the scall has stayed the same and black hair has sprouted in it, the scall has been healed; the person is clean. So the priest is to pronounce him clean.