Photograph it — in case it evaporates before you can share it with anyone.
Look above and below for nibbles, old screws, or crevices — it may have enlarged out of a place.
Just ask your landlord (or maintenance) — at worst they just wipe it away, but it’s better to assume it can be a carrier.
If unsure, get it tested — particularly for mold, pest or chemical.
And if it produces an odd crunching noise when you pull it out? Definitely tell the internet.

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