Why A Small Bright Dot Was Appearing Near The Home Button .
Why a small bright spot appearing on my iPad screen
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Does the bright spot appear in a screenshot? Comparing a screenshot with what you can see on-screen will help you to determine whether or not the bright dot/spot is a screen artefact - or something else.
Take a screenshot on your iPad – Apple Support
When comparing the screenshot, rotate the screen between Landscape and Portrait orientation; this will ensure that the screenshot image, when viewed, does not overlay the same area of the screen. If the bright dot/patch is visible in the screenshot - but moves relative to the physical screen as you switch between screen orientations - then the issue is not a screen defect.
If, however, the bright area remains in the same location of the screen - then you may have screen issue. If you are able to take a photograph with another device - and upload it here - it may be possible to offer additional comment.