Is all black mold the same?

Any mold can be dangerous - some people with compromised respiratory or immune systems will be more susceptible than a perfectly healthy person.

This is the number one reason wall to wall carpeting should not be installed in a bathroom.

I would go so far as to quarantine the room so you do not spread the mold spores. See if it cleans up easily with vinegar - vinegar kills mold spores, bleach does not. If not easily cleaned with vinegar, call in the pros and stay out of the quarantined room, until it can safely be remediated .

https://moldmanusa.com/the-truth-about-toxic-black-mold-its-probably-not-what-you-think/

you can also kill the mold spores with hydrogen peroxide

Spray it down with bleach and let it dry. The wood underneath might need to be replaced if it was wet for a long time - that would be the best solution. Do not put carpet in the bathroom - replace it with vinyl plank flooring, it is easy to put down, affordable and waterproof.

first answer is mis leading as bleach DOES kill mold. see other materials here: https://dengarden.com/cleaning/How-to-get-rid-of-black-mold-the-easy-and-cheap-way

Bleach can kill mold on surfaces that are not porou, such as tiles. However, it will not kill mold on porous surfaces like wood. You need high volume hydrogen peroxide to kill mold on anything porous.

To tell if black mold may be growing in your home, just follow your nose. A musty, earthy smell, like dirt and rotting leaves, is a telltale sign of mold's presence. Stachybotrys smells especially strong. All molds need food, water and a dark, stagnant environment with temperatures that neither freeze nor boil to grow.