Thanks for reaching out seyiilovesmatcha,
It sounds like you're seeing a glowing part of your iPhone screen. We can help.
A good first step would be to Restart your iPhone and see if the issue persists. Many times an intermittent issue can be resolved with a simple restart of the device.
If the light remains after the restart, it could indicate a hardware issue, and you would want to have the device evaluated next. To locate your regions service options, you can connect with Apple directly using either Get Support or if you're in a region without direct support options, you can also Contact Apple for support and service.
Hope that helps.
Take care.