How to inspect a tiny green speck near a screen edge

A tiny green speck near the edge of your screen can be easy to mistake for dust, a software mark, or a damaged pixel. The position can make it especially hard to see clearly, and pressing on the panel can make a problem worse.

Use solid colors to check whether the speck stays in the same place, then compare a screenshot or another display. The Display Test can show colors for inspection, and the Stuck Pixel Fixer can try flashing a pattern if the mark looks like a stuck pixel.

Check the green speck

Open the Display Test and view the screen on plain colors. Look at the speck on black, white, red, green, and blue backgrounds. Avoid touching the panel while you inspect it.
Check whether the mark stays at the same physical point on the screen as you change colors or move a window. Note whether it is a single dot, a small cluster, or a line, and whether it touches the visible edge.
Take a screenshot while the mark is visible, then view that screenshot on a different screen or device. A mark visible in the screenshot may be drawn by software. If it is absent, the panel or its connection is more likely, though a screenshot alone cannot prove the cause.
If you can, connect the computer to another monitor or display the same image on a second screen. Check whether the green speck appears in the same image on both displays.
If it appears to be one stuck pixel, open the Stuck Pixel Fixer and use its flashing pattern briefly. Stop if you feel discomfort or notice eye strain. Flashing patterns may be unsafe for people with photosensitivity, so read when pixel flashing may be unsafe first.

What the result means

The dot changes or disappears on different colors

A single pixel is made of smaller red, green, and blue parts called subpixels. If the green part stays lit while the other parts change, the mark may be a stuck green subpixel. It can look green on a dark background and become harder to notice on a green background. A stuck subpixel is different from a dead pixel, which usually stays dark. For more examples, see how to test a monitor for stuck subpixels.

The mark is visible in a screenshot on another device

The computer may be drawing the mark in software. Close floating widgets, screen overlays, and apps that show recording or performance indicators. If the mark vanishes after closing an app or restarting the computer, it was probably not a defective panel pixel. A fixed dot can also come from an overlay, as explained in fixed dot on screen: overlay or stuck pixel?

The mark is not in the screenshot, but stays on this display

This points toward the physical display path, which includes the panel and its cable or connector. If the speck appears on a laptop screen but not on an external monitor, the laptop display or its connection is a more likely source than a software overlay. It is not a final diagnosis, especially if the mark changes when the lid or cable moves.

The speck looks like dust or changes when viewed from an angle

It may be dirt on the screen surface or a mark on a screen protector. Turn off the display and inspect it under room light. Use a clean, soft microfiber cloth without pressing hard. Do not use a sharp object to probe the edge or try to clean under the panel.

How to fix it

Clean the surface gently. Turn off the screen and wipe the area with a clean microfiber cloth. If the speck moves or disappears, it was on the surface. Do not press on the display, especially near the edge.
Close possible overlays. Exit screen recording, gaming, monitoring, and video call apps, then check again. Restart the computer if the mark remains and you are unsure which app might be drawing it.
Check the screen at its recommended resolution. On Windows 11, open Settings › System › Display and choose the option marked recommended under Display resolution. On macOS, open System Settings › Displays and select the default or recommended resolution. A resolution change will not repair a pixel, but it can rule out a scaling or rendering oddity.
Try a brief pixel-flashing pattern only if it is safe for you. Use the Stuck Pixel Fixer and stop if you feel unwell or uncomfortable. A flashing pattern may sometimes free a stuck subpixel, but it cannot repair a dead pixel, a damaged panel, or a faulty connection. Do not leave it running unattended.
Check for a loose display connection only if you can do so safely. For an external monitor, power it off and reconnect the display cable at both ends. For a laptop, avoid opening the case just to inspect the screen cable unless you have repair experience. A damaged display cable can sometimes mimic a panel defect, as described in how a display cable can cause screen defects.

When it is probably a hardware fault

If the green speck stays in exactly the same place on multiple solid colors, does not appear in screenshots, and remains after a restart, it is likely part of the display rather than an app. A single stuck subpixel may remain unchanged even after a flashing attempt. A group of dots, a line, or a mark that grows or changes when the display moves needs more attention than one stable speck.

Take a clear photo of the screen with the speck visible, and note when you first noticed it. Check the manufacturer’s warranty terms before attempting a repair. For a laptop or phone, a repair shop can inspect the panel and its connections. If the display is covered and the defect is persistent, contact the manufacturer instead of pressing or rubbing the pixel.

Why edge pixels are harder to judge

The bezel can hide part of a pixel, making a normal edge look like a partial green mark. Screen protectors, dust, and reflections are also easier to confuse with a pixel defect near the border. Compare the mark against several solid colors and inspect it straight on, then from a slight angle. Do not use pressure as a test: pressure can damage the panel or create additional discoloration.