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This is due to the fact that the bathroom waterproofing is not done well. The bathroom should be ventilated and opened to reduce moisture! Otherwise, the bathroom will have to be waterproofed again.
The problem is how good it is off the ground.
This one is frozen back from the outside, it's not good to clean it thoroughly, it's cleaned up this year, and it will appear next year, but it won't collapse. If you want to be beautiful, you can decorate it and block it.
1.If the exterior wall is blistered, if it does not affect the residents in the toilet or downstairs, it is recommended to only do partial modification of the exterior wall. If water seepage from the external wall has affected the normal use of the toilet or downstairs residents, it is necessary to re-waterproof. >>>More
Ask the management office to coordinate and make a neutral judgment.
Don't rush to knock on any tiles! There may be a way to salvage: >>>More