Update: It hasn't gotten any worse, but rubbing stuff still hurts it, (don't take that out of context) the skin is less puffy and blistery and more just dark and purpleish now. It was also my dominant hand, so I'm gonna have to cut back on the gaming for a while which is probably for the best.

It probably wasn't. The sign says it was -30 but it was pretty ventilated so I doubt it was actually -30. But yeah, it looks like just surface wounds.