Please know that the mold is not growing inside your mat. The antimicrobial treatment on the interior TPU of the mat is permanent, and incredibly effective at preventing any growth inside the mat.
If mold is forming in the exterior of the mat, it is likely that the mat has been put away damp. Even if you did not experience precipitation or other obvious moisture on a trip, condensation can occur between the relatively warm mat and the cold floor of a tent. A rolled-up mat is the perfect environment for mold to develop on the exterior of the mat.
Treat the mold with an enzyme cleanser and a non-abrasive sponge. It will not eliminate the black spots, but it will kill the mold that causes them. Allow the mat to completely air dry before packing it again.
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