black spots

That looks like insects, possibly silverfish or something like that.

hm I'm not a mold expert, but that doesn't look like it to me. It's too clearly defined and distributed too oddly, also rod-shaped.. hm. I rather guess pupated insects, eggs or something like that. A close-up would be really good.

There is mold that looks very similar and is very concerning, but the picture is not clear. Further information is advisable.

I will take better pictures with my DSLR

Better scrape it off with a scalpel and have the sample analyzed in a lab. Costs a hundred bucks and you are on the safe side.

Here are a few more pictures, maybe you can see more there.


How should I best approach this?