It could be the bandage, but that cut looks deep. Maybe it's the angle, but if it is deep, have you considered letting a doctor see it to see if it needs stitches?
I don't know when you got it, but now that it has something greenish in it, it might be the start of infection. (It could also be from the liquid bandage, but it never hurts to get it checked out.)
Hello~I would definitely see your GP, you don't want to get a full-blown infection.