A small bright light has appeared in the bottom left hand corner of my iPhone 8
A small bright light has appeared in the bottom left hand corner of my i phone8 would you know why
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That sounds like a hardware failure. Probably the screen
You should arrange a repair iPhone Repair - Official Apple Support
or Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
You can see additional service information for preparing your device for repair within the following article:
Find out how to send your iPhone to Apple using the Express Replacement Service – Apple Support (UK)