Why does dust appear on the macbook pro case in certain places?

A

Andrew2016-07-04 21:06:13

macbook

Andrew, 2016-07-04 21:06:13

Good day dear friends!
Next question. Today I noticed the following: Macbook Pro Retina 13. Stands on the table, connected to the network and to the monitor. I use it in a closed state with a connected mouse and keyboard. The laptop was about 5 days off, but connected to the network and monitor via HDMI. Dust in the form of even ovals appeared on the case from above in certain places (in the picture in the application). What could it be? Are there magnets? Doesn't hit with static. Just wondering how it came about.