I phone 7 plus protruding black rubber?

So I bought an iphone 7 plus 6 months ago and everything was normal. Today I noticed black rubber thing protruding From under the the gluss sxreen and the place it is connected to the phone. Can anyone tell me what it is and is it bad and if I should get it removed repaired or smth.

If this were a NEW out of the box phone, I would return it and exchange it for a new one.

But since it is 6 months old, it looks like it may have been dropped or opened and the seal was not in place when it was closed up. I'd at least take it to an Apple Store and have them reset the seal, that way you don't ward any warranty you may still have, letting a third party open the phone (if brand new when you got it).

It was a brand new out of the box. But unfortunately I'm in Ukraine and didn't want to get it opened by a third party ( but guess will have to

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