Hidden Mold
Mold has a tendency to spread quickly so you want to check closets, bathroom vanities, cabinets not used often periodically. Here a closet was affected and we remediated it.
Sometimes closets or bathrooms don't have an HVAC vent in them and that can cause moisture to build up and we don't see it until mold has taken over.
If you have rooms in your home or business that are closed up and near your water heater, air conditioner unit, plumbing, etc. take a look once in a while to make sure you don't have an unseen problem that your not even aware of.