Found my iPhone 6 screen separated, how to repair it? I was traveling by air very recently, and once I got home I noticed that the button on my iPhone 6 seemed to be more deeply recessed. After a while I realized that this did not make any sense mechanically, so I removed the Rhinoshield phone protector and discovered that the screen of my phone was slightly pulled off!

How this happened I do not know, but phone is old and the battery is going downhill these days fairly quickly. It was also opened several years ago for a screen repair, so I supposed it might have somehow spontaneously popped open.

Is there any way that I can try to close this back up myself?

Could battery swelling have caused this, in which case I shouldn't try?

The poor quality photos are from my laptop. I have turned off the power of the phone right now for safety reasons.
Yes, the swollen battery could have pushed the display outwards (the battery is just beneath the display)

I would replace the battery with this guide:

https://www.ifixit.com/Guide/iPhone+6+Battery+Replacement/29363