Unfortunately it looks more like disease than traumatic injury (which would be unlikely in a group of ember tetras, if I had to guess a most likely culprit in your livestock mix, it would be the Amano shrimp)
Daily water changes improve most fish health issues
- though this particular fish doesn’t make my “most likely to survive list”
... once damage extends through the fins into the body, there is often significant internal infection as well
And looking at the photos I suspect Columnaris and would remove this fish to a hospital tank (any food safe bin with a sponge filter and 20 - 22*C, no substrate, daily water changes, some general antibacterial remedy (which will help reduce secondary infections) such as eSHa 2000 (this contains copper so although several report no issues with shrimp, use with caution))
How long have you had these fish?
Any new additions in the last few weeks?
New tank? Or is there some history of illness in the tank?
Aquarium details???
Temp
pH
Hardness
Maintenance routine
Planted (I assume re livestock)