How do you get rid of mold on the ceiling in the house?

Kate
by Kate

I just saw three or four four inch trails of mold on the inside ceiling leading from the outside porch ceiling. It appears to be black. What type of health danger does this present? Also, the fan in the bathroom does not work. Would there be mold there too? (It is not my house but I am staying here for a few months). How do I tell them without insulting?

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