After the death of Awaab Ishak, a few words on black mold. Do you have a couple of spots of mold in your shower? Like, maybe top corners on the grouting? That. Well, it might be. It might be a different mold. The really nasty one is Stachbotrytis chartarum. This one. https://en.wikipedia.org/wiki/Stachybotrys_chartarum

There are others it can be, the most likely is Aspergillus niger https://en.wikipedia.org/wiki/Aspergillus_niger #blackmold #AwwabIshak

Which do you have? And should you be worried?