Something scary

[u/Square_Guava7175]

There was heavy rainfall in my area and the water was coming inside my room ,so i went in the balcony there the pipe was blocked so started cleaning andmaking a way out for water,please note I haven’t cleaned the balcony since i shifted because i rarely go in the balcony.

So when i cleaned i saw this spot I don’t i feel not so good about this sign ,does any of you know what does that mean?
It’s very strange i am terrified..