After it dried and left a stain, I twice sprayed Kilz on the spot. I had purchased a type of Kilz that blends in with the regular color of the ceiling, so that you can't even see it.
Since then, whenever someone takes a shower, the spot has moisture from the humidity/steam from the shower binding to the spot, until the moisture dries. This isn't from above the ceiling.
What can I do about this - would simply painting the area solve this?