“If there is in the skin of one’s body a boil and it heals,
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
The flesh also, in which, even in the skin thereof, was a boil,.... Or hot ulcer, by which, says Maimonides (n) you may understand any stroke by a stone, stick, or iron, or any other thing: and in the Misnah (o), it is asked, what is an ulcer (or boil)?
In the skin thereof, was a boil - Scheuchzer supposes this and the following verse to speak of phlegmonic, erysipelatous, gangrenous, and phagedenic ulcers, all of which were subjected to the examination of the priest, to see whether they were infectious, or whether the leprosy might not take its origin from them.