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Mold in attic above bathroom.
Matte and other low sheen paints absorb much more moisture which in turn leads to mold growth.
Notice how the dark line on the insulation in the photo below line up with the top plate.
This is why you rarely find mold growth in the attic above a garage or a rarely used portion of the home.
Paint the bathroom ceiling with a high sheen gloss paint.
What causes black mold in attic.
As air leaks migrates from the home into the attic it carries soot and dust particles.
Dryer vents plumbing vents kitchen or bathroom fans vented into the attic.
Mold needs 3 things to grow.
Insulate the attic space above the bathroom to prevent excessively cold surfaces on the ceiling.
Moisture food and warmth.
If you eliminate just one of these elements mold will starve and die.
This is a different perspective from the other video about bathroom fan venting causing mold.
Attics usually have a passive ventilation system in which outside air comes in through the soffit eave vents at the bottom warms up in the attic and escapes through the can or ridge vents at the top because hot air rises.