וְרָאָ֣ה הַכֹּהֵ֗ן וְהִנֵּ֤ה מַרְאֶ֙הָ֙ שָׁפָ֣ל מִן־הָע֔וֹר וּשְׂעָרָ֖הּ הָפַ֣ךְ לָבָ֑ן וְטִמְּא֧וֹ הַכֹּהֵ֛ן נֶֽגַע־צָרַ֥עַת הִ֖וא בַּשְּׁחִ֥ין פָּרָֽחָה׃
And the priest shall look; and, behold, if the appearance thereof be lower than the skin, and the hair thereof be turned white, then the priest shall pronounce him unclean: it is the plague of leprosy, it hath broken out in the boil.
Targum Jonathan on Leviticus
And the priest shall look; and, behold, if the appearance of it be deeper than the skin, and it becometh white, and the hair is turned white, the priest shall make him to be unclean; for it is a plague of leprosy which increaseth in the ulcer.