Which excerpt from the poem "Tattoo" by Gregg Shapiro is a symbol for the Holocaust experience?

"blue as blood on his left forearm"

"spilling his protection, like acid"

"I am drowning in his silence"

"Questions choke me"

I actually read this poem upon reading your question, And I can conclude that it would be "Blue as blood on his left forearm"

You see, he is speaking of the numbers that were put on his fathers arm between his wrist and forearm as a numbering system.

The excerpt from the poem "Tattoo" by Gregg Shapiro which is a symbol for the Holocaust experience is "blue as blood on his left forearm."

It refers to the fact that Auschwitz people were tattooed if they worked there, and killed if they weren't selected to be workers.