Typically your only recourse is to repaint.
Mold yellow spots on ceiling.
If it doesn t it s likely dirt or a similar looking stain.
If the spot fades fast it s probably mold.
I think everybody knows what mold looks like.
Most people are accustomed to seeing black and gray mold and maybe green or blue but people may not realize that mold comes in all colors.
This has got to be the most disgusting type of ceiling stain if you ask me.
Water stains will reappear if the original cause isn t dealt with.
Remove any mold with a clean rag or sponge and throw it away.
How to identify an up close photo of mold on a ceiling.
In this case it was due to areas of missing insulation in the attic.
Aspergillus some forms of aspergillus appear yellow.
Ceiling mold growth is typically black.
Cigarette smoke can cause staining via the same principle as ghosting.
If your ceiling is moldy you may have a water leak in it or behind the walls.
Cleaning soot from ghosting is extremely hard.
Technically it s not a stain but rather a growth.
Painting over a yellow stain is a temporary fix at best.
Types of mold that are yellow.
Yellow mold in the home.
Mold can be found in many colors including black white brown green and yellow.
The soot attaches to cold spots on the ceiling.
Several types of mold can appear yellow in color including.
It can also be found under leaky sinks around leaky window frames and in attics or on ceilings when roofs leak.
Replacing the actual drywall on your ceiling may be necessary when the drywall is riddled with mold or unstable due to prolonged water exposure.