Why is my wrist bone abnormally huge the one aligned with my pinkie on my left hand?

Ulnar styloid. Is the name of the prominence of this part of the ulnar bone. In slim people it can be quite prominent, however it could also be prominent because it has become injured if you have recently had trauma and if this is the case needs urgent X-ray to exclude fracture. Best here to get a doctor licensed in your area to examine your wrist and then they can determine if normal appearance or not.
Size. It is not unusual for the ulnar styloid to be large and should not cause you any problem .

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