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Is this mold or just some dark dust?

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I just bought a second hand lens that was supposed to be like new, almost unused, but after receiving it I noticed this black stuff on the lens mount. It can be cleaned, and that stuff was only in this small hole and a little bit on the rim. As far as I can tell the rest of the lens is really like new with no scratch or other defects, but I wonder if this is some kind of mold and so if I should perhaps return it or if it is just dust that sticks a little bit harder than “normal” dust and it would be fine to use the lens. I’m in Japan which is a fairly humid country.

r/Cameras - Is this mold or just some dark dust?
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Even if it was mould would you really return an otherwise perfect second hand lens for this?