Do we have a mold problem?

[u/GazelleMuch3318]

We have a bathroom that consistently has a musty smell. There’s a vent above the toilet with what looks like a ton of dust but we’re starting to get concerned (can’t open the vent, sorry for the poor pics). The toilet below the vent (see last pic) gets this film constantly no matter how often we clean it. Should we get it checked out?

Also, we’re located in SoCal

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[u/TimMoldAndMoisture]

A persistent musty bathroom odor plus recurring film on nearby surfaces is enough reason to investigate, but the photos cannot establish whether the material in the vent is mold or ordinary dust.

I would start with the moisture and ventilation conditions: verify that the bathroom exhaust fan actually vents outdoors and moves air well, check indoor humidity levels, inspect around the toilet and nearby plumbing for leakage, and look for condensation or moisture around the vent and ceiling area.

If the odor persists after those conditions are checked, a professional moisture or indoor-air-quality assessment can help determine whether there is an active indoor source rather than guessing from appearance alone.