John Gill Commentary Leviticus 13:18

"And when the flesh hath in the skin thereof a boil, and it is healed," — Leviticus 13:18 (ASV)

The flesh also, in which, [even] in the skin thereof, was a
boil
Or hot ulcer, by which, says Maimonides ^F14 you may understand any stroke by a stone, stick, or iron, or any other thing: and in the Misnah ^F15 , 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.

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FOOTNOTES:

• F14: In Misn. Negaim, c. 6. sect. 8.
• F15: Ib. c. 9. sect. 1.