Leviticus 13:2

A rising, a scab, or bright spot The leprosy appeared in one of these three forms. Now, as these marks might sometimes be upon the skin when there was no leprosy, rules are here given whereby the priests might discern between a plague of leprosy and the resemblance of it; that accordingly they might pronounce a person clean or unclean. Some of the symptoms of the leprosy here described are of a very extraordinary nature, particularly its infecting houses and garments. This has led several of the learned, Le Clerc in particular, to imagine that Moses's leprosy was one of those diseases which Providence occasionally inflicts upon mankind in certain ages and countries, as a chastisement for peculiar sins, and to bring them to repentance and reformation. Thus much is certain, that what we now call the leprosy is very different from what went by that name in former times.