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There are wood products, and there will be moisture.
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A kind of southern one, mosquito control,
The weevil, also known as weevil, weevil, weevil, is one of the most diverse species in the order Coleoptera, and it is also the largest group of insects, with more than 60,000 known species in the world, and the growth process is completely metamorphosed. The insect has a long muzzle, like the trunk of a zoo elephant, but don't think of it as a trunk, it is the mouthpart that the weevils use to feed. In addition to the weevil's snout, the antennae growing at the base of the snout are very unique. >>>More
Theoretically, there should be none, but in practice it is allowed to be at a certain error.
The wall tiles of the bathroom, due to the change of humidity, the material will swell, or shrink, if the gap is too small, there will be greater stress, easy to crack, or fall off.
Look at the photo if it is green, it looks like a rodent insect.
Do you have a picture? It may be a jumping worm, which is harmless to humans, and can be diluted with rotenol and sprayed.