It's more than likely just the clipping indicators are switched on. Press "J" to turn them off if you don't want to see where the image is clipped but consider whether you want to just "turn them off".
They are there for a reason, and "may" indicate you have a problem that needs correction.
Areas that are clipping to black are shown with a blue overlay, areas clipping to white are shown with a red overlay.
Check the below article for more information:
Thanks heaps all good just a novice to lightroom and still learning the system.