That is what they look like while swallowing. Which tends to happen while something is passing through the throat of the snake. This tends to bounce back quickly.
Hazarding a guess I would say there is something in it's throat. It is possible that checking this possibility could harm the snake.
That said, and knowing the risks, if you wanted to test this theory your self you could easily do so by touching the neck from the side. Essentially imagine touching the edge of a piece of hanging fabric from one side to have the fabric brush over your finger. With its skin as with fabric you would be looking for it to have give, like there isn't something internal. This would be very gentle and would involve touching from the side of whatever is stuck in there, not the edge or the tip, which could injure the snake.
There is a second way to test the same thing that is entirely passive, observe. It could take hours, but if it looks like there is something solid granting structure to the loose skin, you have something caught in its throat.
Identifying this in either way would help with a vet visit as it could target what the issue may or may not be before you go. If this is the issue the doctor will likely restrain the snake or put it under, then use a pair of hemostats to remove what is lodged in there. I wouldn't be surprised if it were a piece of that bedding
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