Charles Ellicott Commentary Leviticus 13:27-28

"and the priest shall look upon him the seventh day: if it spread abroad in the skin, then the priest shall pronounce him unclean: it is the plague of leprosy. And if the bright spot stay in its place, and be not spread in the skin, but be dim; it is the rising of the burning, and the priest shall pronounce him clean: for it is the scar of the burning." — Leviticus 13:27-28 (ASV)

And the priest shall look. —The directions here given as to what the priest is to do at the end of the week’s quarantine are the same as those given in Leviticus 13:23-24. It will be seen that there is a difference in the treatment of the suspicious symptoms in case No. 1, and in the case before us, No. 3. In the former instance, where there is no apparent cause for the symptoms, the suspected invalid has to undergo two remands of seven days each before his case can be decided; while in the instance before us, where the boil, the inflammation, or the burn visibly supplies the reason for this suspicion, he is only remanded for one week, at the end of which his case is finally decided.