Leviticus 13:21

But if the priest look on it ,.... Upon a person in a like case as first described, having had a boil, and that healed, and afterwards a white swelling, or a bright spot in the place of it:

and, behold, there be no white hairs therein ; not two hairs turned white, as Gersom interprets it:

and if it be not lower than the skin ; the bright spot not lower than the skin; not having got into the flesh, only skin deep: the Targum of Jonathan is, not lower in whiteness than the skin; for the bright spot is described as white, and so the rising or swelling, Leviticus 13:19 ,

but be somewhat dark ; or rather "contracted"; to which spreading is opposed in the next verse; See Gill on Leviticus 13:6 ,

then the priest shall shut him up seven days ; to wait and see whether it will spread or not: a boil and burning, the Jews say, make a man unclean in one week, and by two signs, the white hair, and the spreading; by the white hair, both at the beginning and at the end of the week after dismission, and by spreading at the end of the week after it F17 Misn. Negaim, c. 3. sect. 4. .