You should call a professional and consider buying a screen for your washroom window so you can leave it open without bugs getting in. It's not too uncommon for mold to form on bathroom ceilings if there is not proper ventilation. This type of mold takes a very long time to cause adverse health effects, which is a silver lining.
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Just go to the doctor. Mold is dangerous and you should protect your shin if you are trying to clean it. The best thing to do is call your rental and let them know so they can fix it. It's they house so they have to get it cleaned.
Repaint everything with a paint containg a mold killer (a healthy one like a silver based or a zinc pirythion based). And after that ventilate your house on a regular base. Mold means high humidity and non-moving air in the house.
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