However, an aid spell will restore lost hit points to necrosis (though one must be a believer in the cleric's religion) as will a heal spell. Both healing salves and boric serum will be effective against necrosis.
Rest of any kind will have no effect whatsoever on necrosis-damaged hit points, nor will binding wounds. In fact, necrosis will have the opposite effect as rest, causing the affected creature to lose 1 hit point per level per day as the necrosis spreads through the body. Any necrosis damaged tissue that is left will continue to destroy health flesh at the same rate. This will continue until all hit points lost to necrosis are restored or the character dies.
Violet fungi, green slime, yellow mold and numerous other creatures cause necrotic damage.