Or with the cursor over the desktop hold ctrl and spin the middle mouse button, that'll just increase the size of the desktop icons.
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Do you live with other people / could someone edit your desktop background and photoshop a picture of some kind of icon on it?
If you suspect malware, try Malware Bytes Anti Malware (If prompted to install realtime protection or a free trial of the premium version, decline. You can use the free manual-scan version to scan your machine for issues and upgrading to premium would probably just be a hassle if you intended on keeping it around for the future. When starting a scan, do a custom scan and deselect 'Scan Within Archives' as you almost never need to do that and that should reduce scan time to 15-45 minutes instead of hours.)
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Might be part of the UI or some kind of tooltip window/context menu of a program you use?
You could try using Process Explorer to figure it out, maybe.
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