Small bleeding in the earWatch
If it happens again or you know it was from properly inside your ear then you should probably see a doctor about it just to be safe. Ditto if there's any ear ache or other pain past what you could expect from a little spot.
You could also call a pharmacy to see what advice they can give.
You could also ask somebody to shine a torch at your ear and see if they can find the remains of a spot or little cut. Just don't put anything inside your ear or fuss about poking at it cos that could make it hurt or damage your ear.