If mold has begun to grow in your bathroom you need to remove it immediately. All mold, even non-toxic mold, can make you sick. In fact, non-toxic mold is more likely to make you sick, because it’s so common.
Mold can often be found in the shower and the bathtub. Grime from body oils and soap scum which is washed off and onto the shower or tub create a food source for mold to feed on. And of course there are abundant water sources for mold created by the running water and steam.