Skeg Diagnosis needed

Posted by Infinite_Spinach_880@reddit | sailing | View on Reddit | 6 comments

Upon taking my boat out for winter I see the following damage on my rudder skeg. Not quiet sure what caused it as I never ran a ground.

When knocking around the skeg seems solid.

Any mire advanced sailors shed light in what might be the cause and if the remedy is just simply filling with something?