צָרַ֨עַת נוֹשֶׁ֤נֶת הִוא֙ בְּע֣וֹר בְּשָׂר֔וֹ וְטִמְּא֖וֹ הַכֹּהֵ֑ן לֹ֣א יַסְגִּרֶ֔נּוּ כִּ֥י טָמֵ֖א הֽוּא׃
it is an old leprosy in the skin of his flesh, and the priest shall pronounce him unclean; he shall not shut him up; for he is unclean.
Read kabbalistic (mystical) interpretation of Leviticus 13:11: and classical mystical sources.