I have seen similar in snakes for two reasons. The snake was fed prey that was too big or taken awkwardly (sideways) and jammed open the throat flesh and caused it.

I have more often seen it in snakes that had borderline upper respiratory infections and needed heat and humidity tweeks. One needed meds.
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Sonya

1.1 Candoia Paulson
2.2 Western Hognose
1.2 Mexican Black King
1.3 Greenish Ratsnake
1.1 Yellow Ratsnake
3.1 Everglades Ratsnake
2.1 Honduran Milksnake
0.1 Mexican Milksnake
1.1 Black Pinesnake
1.2 Sumatran Shortailed Python
1.3 Boa constrictor
2.2 Childrens Python
1.0 Irian Jaya Python
0.0.2 Timor Monitor
2.2 Mossy Leaftail Gecko
1.1 African Helmeted olivacea
0.1 Savannah Cat F7
1.1 Sugar Glider
Numerous Dogs, Cats, Birds, Fish pets and fosters
Husband
2.1 teens plus…..
You get the picture.

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