Yes, it's likely mold that grows only when conditions are favorable... likely during winter months when the interior of the room is cold and negative pressure brings warm moist air in. The door stop is where the two contrasting temperatures meet and where condensation occurs, and the mold can only grow when the humidity level there is high. At all other times of the year it will be dormant due to a lack of moisture. It could also be dust that accumulates on the trim when it's moist. Clean it off and forget it. Its nothing to worry about.
Thanks for the quick reply. The guy in the video I watched used caulk and made it look easy, but I like the idea of glazing tape. I will check it out. Thanks again.
Here's an example. https://www.amazon.com/DC-WGT-01-Dou...s=Glazing+tape
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