John Gill Commentary Leviticus 13:17

"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." — Leviticus 13:17 (ASV)

And the priest shall see him
Review him, and examine him thoroughly:

and, behold, [if] the plague be turned into white ;
the raw flesh in the swelling, which looked red, is become white:

then the priest shall pronounce [him] clean [that hath] the plague ;
that was supposed to have the plague of leprosy; but upon a review, and on this change of things, has not, he shall declare him free from it,

he [is] clean ;
and under no obligation to the laws and rites concerning it.