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This types of fracture can happen sometimes if the side of the head, including the ear touched the wooden flight of stairs. The impact of the bone with the hard surface of the stairs could be responsible for such type of fractures . The presence of the contusion also signifies that the injury was strong enough to result in a comminuted fracture.
A high resolution Ct scan of the petrous temporal bone could well reveal the fracture as well as any other contusions in the brain.
You should consult your GP and get an X ray done, if not done already. This should be followed by the CT scan of the head and petrous bone.
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