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It may be termites, there are termite control stations in every place, and you can go there and buy termite medicine.
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It may be bleaching powder particles.
Do you have a picture? You should be talking about slugs, also known as slugs, like snails without shells, active in humid environments, feeding on plant leaves, you can check the encyclopedia.
Hurry up to get rid of termites, otherwise there will be endless troubles.
This is born from grains, dried fruits, and Chinese medicinal herbs. >>>More
It may be, to find out if there are small holes in the furniture, you can spray insecticides on it, or you can use a syringe to inject water into the hole and seal it with wax, pay attention to a full seal that does not leak.
I think it's too humid, I see you keep the room dry, if you really can't do it, it's better to redecorate.