Joseph Benson's Commentary of the Old and New Testaments - Leviticus 13:29
Leviticus 13:29. Upon the head or beard Pliny tells us, that a kind of disease came into Italy in the middle of the reign of Tiberius Cesar, which commonly began in the chin, and was therefore called mentagra, and was so filthy, that any death was preferable to it. It was a foul tetter, scab, or scurf, not unlike a ring-worm, which, from the chin, often ran over the face, the neck, the breast, and the hands. Was not this similar to this plague of leprosy in the beard and head here spoken... read more
Albert Barnes' Notes on the Whole Bible - Leviticus 13:30
Scall - As this is the name for another disease not allied to the leprosy, it would have been better to retain the original word נתק netheq. It is a true elephantiasis, and is recognized by modern writers under the name of the Fox mange. read more