What does Leviticus 13:55 mean?

and the priest shall look, after that the plague is washed; and, behold, if the plague have not changed its color, and the plague be not spread, it is unclean; thou shalt burn it in the fire: it is a fret, whether the bareness be within or without.

And the priest shall look on the plague, after that it is washed: and, behold, if the plague have not changed his colour, and the plague be not spread; it is unclean; thou shalt burn it in the fire; it is fret inward, whether it be bare within or without.

and the priest shall look, after that the plague is washed; and, behold, if the plague have not changed its color, and the plague be not spread, it is unclean; thou shalt burn it in the fire: it is a fret, whether the bareness be within or without.

And if, after the mark has been washed, the priest sees that the colour of it is not changed and it is not increased, it is to be burned in the fire: the disease is working in it, though the damage may be inside or outside.

And the priest hath seen <FI>that which hath<Fi> the plague after it hath been washed, and lo, the plague hath not changed its aspect, and the plague hath not spread, --it <FI>is<Fi> unclean; with fire thou dost burn it; it <FI>is<Fi> a fretting in its back-part or in its front-part.

And when he shall see that the former colour is not returned, nor yet the leprosy spread, he shall judge it unclean: and shall burn it with fire, for the leprosy has taken hold of the outside of the garment, or through the whole.

And the priest shall look on the sore after the washing, and behold, if the sore have not changed its appearance, and the sore have not spread, it is unclean: thou shalt burn it with fire: it is a fretting sore on what is threadbare or where the nap is gone.