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Tear down the ceiling to see if there's anything dead... If not, it may be that your board is not a good worm... It just looks like a maggot ... Then you'll have to change the ceiling.
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Go up and have a look, check it out, clean it up.
Buy a bottle of termite medicine to kill them, there is likely to be a termite nest on the toilet ceiling.
It should be the larvae of flies, maggots. Just spray some pesticides.
If the leak is severe, it is possible. However, in general, there will be no moss on the ceiling unless it is blistered for a long time. Hope mine can help you, hope!
A form of ants, a heat-loving, light-loving, slightly damp environment! Kitchen ceilings are perfect for their habits! Nature lives in the top! But they have a short lifespan! Just die on top!
The water seepage on the ceiling of the living room is generally the water that leaks and seeps down, what is the corresponding position upstairs? The general pattern is the same, if it is still a living room, see if there is floor heating, find out the cause of water leakage, and solve the symptoms.