then the person must shave himself except for the scaly area. Then the priest shall isolate him for another seven days.
The priest is here instructed what judgment to make if there was any appearance of a leprosy, either, 1. In an old ulcer, or bile, that has been healed, Lev 13:18, etc. When old sores, that seemed to be cured, break out again, it is to be feared there is a leprosy in them; such is the danger of those who, having escaped the pollutions...
Commenting on Leviticus 13:18-37
And in the seventh day the priest shall look on the scall,.... That is, according to Ben Gersom, on the thirteenth day from the first inspection of him by the priest: and, behold, if the scall be not spread in the skin, nor be in sight deeper than the skin; neither appears spread on the surface of the skin, nor to have eaten into the...
The scall shall he not shave - Lest the place should be irritated and inflamed, and assume in consequence other appearances besides those of a leprous infection; in which case the priest might not be able to form an accurate judgment.