The Writer's Bump

The scar on my upper arm? An early chapter, at least.
My gut is a reoccurring theme throughout.
Even my hairline can be worked into the story,
a progression, a personal timeline.
The way my third toe on the left foot
curves slightly to the right; 
the mole behind my right ear.
Then there's what is not visible.
The fractured rib, long heal'd;
whatever state my arteries are in.
And the callus on my right middle finger?
It is thousands of pens and pencils;
it is my vocational mark, my avocation's residue,
the title of my autobiography.