A nega that doesn’t change in the first week must be laundered and quarantined. If it remains unchanged for the second week, it must be burned. One that spread in the first or second week must be burned. If the spot was dull at the outset, Rabbi Yishmael says it should be laundered and quarantined, though the Sages say that this is unnecessary. If the nega became dull during the first week, it must be laundered and quarantined. If it became dull during the second week, it must be torn out and what was torn out must be burned. One must put a patch where the nega was, though Rabbi Nechemya says that doing so is unnecessary.
If the nega returns to the garment, the patch is not affected; if it returns to the patch, the garment must be burned. If one made a patch from a garment that was quarantined and declared pure, and then the nega returned to the garment, the patch (which is on a second garment) must be burned. If the nega returned to the patch, the original garment must be burned and the patch continues to serve the new garment while the signs of nega impurity are checked.