(18) The flesh also, in which.--Rather, and if there is in the skin of the flesh a boil. The third case, discussed in Leviticus 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 Leviticus 13:24.

Verses 18-23. - The method of discriminating between a leprous spot and the reappearing scar of an old ulcer. A reappearing ulcer is to be regarded as leprous it' it have the characteristic marks of leprosy; that is, if it be below the cuticle, and the hairs round it arc turned white. If it has not these marks, it has to be watched for seven days, and if in that time it does not spread, it is to be declared a burning boil, or rather an ulcerous scar, in which case the priest shall pronounce him clean.

13:18-44 The priest is told what judgment to make, if there were any appearance of a leprosy in old sores; and such is the danger of those who having escaped the pollutions of the world are again entangled therein. Or, in a burn by accident, ver. 24. The burning of strife and contention often occasions the rising and breaking out of that corruption, which proves that men are unclean. Human life lies exposed to many grievances. With what troops of diseases are we beset on every side; and thy all entered by sin! If the constitution be healthy, and the body lively and easy, we are bound to glorify God with our bodies. Particular note was taken of the leprosy, if in the head. If the leprosy of sin has seized the head; if the judgment be corrupted, and wicked principles, which support wicked practices, are embraced, it is utter uncleanness, from which few are cleansed. Soundness in the faith keeps leprosy from the head.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)? a stroke by wood, stone, pitch, or hot water; all that is from the force of fire is an ulcer:

and is healed; by the use of medicine, and the part, in all appearance, as well and as sound as ever.

(n) In Misn. Negaim, c. 6. sect. 8. (o) Ib. c. 9. sect. 1.