Discoloration on the walls, Germany

Hi, I have a quick question. I’ve recently noticed some discoloration in the corners of the room and near the ceiling, and I’m wondering if it could be mold. It’s quite subtle and doesn’t show up well on camera, but it’s noticeable in person. Additionally, there has always been a dent in the wall, but now it has a greenish-blue tint, and when I touched it, it felt soft. Could you advise on what this might be?

by Different_Move1593

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