Bathroom mould

[blacknife]

The bathroom is beside the stairway to the bathroom and the stairway has a big patch where the drywall has been replaced behind the shower, unfortunately the drywall behind the surround is not green board or anything like that. It sucks. I am laid of and on ei and have the time to fix-up the house but not the $$.. Oh well.. Caulk it up and when I get saved up ill do it proper.