Signs of frostbite? Or am I overreacting? Maybe just a bruise?

I just came back from Norway on a northern lights trip and spent a “fair” amount of time without gloves in -4 whilst fiddling with camera settings here and there, and then in the morning in -7 (plus wind = “feels like -17”), again, fiddling with camera and just got back home and noticed my finger looking this way.

I could have hit my hand but can’t remember. Does this look concerning for any cold experienced people out there?