Hi CarlHedemalm1,
This is most likely a display issue. However, it could be calibration or software related. Can you confirm if your device is updated? In some cases, updating the device resolves the issue. You can check this **link**for the Surface Pro 4 update history. If the yellow spot still visible, then uninstall and reinstall the display driver.
If the issue remains, Reset touchscreen calibration. Here’s how:
- Press the Windows logo key.
- Enter calibrate, use the arrow keys to highlight Calibrate the screen for pen or touch input, and then press Enter.
- Press the Tab key until the Reset button is selected, and then press Enter.
If the Reset button is dimmed, your Surface touch calibration is still at factory settings. 4. Press the Tab key until the Yes button is selected, press Enter, and then follow the on-screen instructions.
Kindly update us with the results.