Leviticus 13:39 Commentary - Ellicott's Commentary for English Readers (Old and New Testaments)

(39) Then the priest shall look.—If the priest, upon examination, finds that these elevated spots are of a dull or palish white colour, then he is to pronounce the patient clean, that is, free of leprosy, since it is simply a white eruption or tetter, which lasts for a few months, causes no inconvenience, and by degrees disappears of itself. Hence it is called bahack, or “white scurf,” and not leprosy. This nameless disorder, which still prevails in the East, is to this day called by the Biblical name bahack.