My burn blister has popped?

Two days ago I got a small burn blister that didn't hurt. At some point today, it popper by itself, which I didn't even feel. But now there is a red mark where the blister was and the skin is bubbly/flabby, if you know what I mean. Will the skin go back to normal and will the red mark go away on its own, or do I have to do something?