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It should be mold! It's just damp or moldy! You can buy some sprays! Try! Or look where it's moldy, don't let the bathroom always be damp! How ventilated! How clean! Clean more!
It is recommended that you must do a good job of hygiene to remove mold. It could be a small insect that is a bacterium on the wall and then multiplies. >>>More
It is a mollusc (larva of slugs).
There is nothing to the human body >>>More
Buy a leprosy removal, mix it with a kilogram of water, and spray it.
The image is not clear, but there is a high probability that it feels like a dust lice. The following methods can be tried: spray with hot water in a spray bottle, and add alkaline substances to strengthen it, such as laundry detergent. >>>More
It may be that the toilet has not been cleaned much for a long time and has bugs, so you can clean the toilet regularly or spray some insecticide.