Leviticus 13:18 Commentary - Ellicott's Commentary for English Readers (Old and New Testaments)

(18) The flesh also, in which.—Rather, and if there is in the skin of the flesh a boil. The third case, discussed in Lev. 13:18-28, is of leprosy developing itself from a healed boil, or from an inflammation which has apparently been healed. According to those who administered the law in the time of Christ, the boil and inflammation here meant are such as arise from a stroke by a piece of wood or a stone, and from having come in contact with pitch or hot water, thus distinguishing it from the burn by fire mentioned in Lev. 13:24.