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try spraying bleach then paint with kilz. perhaps you need to address a moisture problem.
Vinegar!
https://restorationmasterfinder.com/restoration/what-kills-mold-bleach-vs-vinegar/
Room needs better ventilation, even a portable fan will do, or possibly a dehumidifier.
What room is this?
Clorox cleanup
spray Concrobium mildew/mold remover .. it's the ONLY thing that will actually kill the mold spores IN the pores of the paint ...