וְרָאָ֙הוּ֙ הַכֹּהֵ֔ן וְהִנֵּ֛ה נֶהְפַּ֥ךְ הַנֶּ֖גַע לְלָבָ֑ן וְטִהַ֧ר הַכֹּהֵ֛ן אֶת־הַנֶּ֖גַע טָה֥וֹר הֽוּא׃ (פ)
and the priest shall look on him; and, behold, if the plague be turned into white, then the priest shall pronounce him clean that hath the plague: he is clean.
Read kabbalistic (mystical) interpretation of Leviticus 13:17: and classical mystical sources.