I'm glad you said it before I had too. Absolutely no disrespect to @size26s as he is lean and hard. Due to that conditioning he looks bigger than he is. Add a pump, good lighting, tanning and the perfect pose by himself (bicep pulled in hard against the lat) and that's the bodybuilding illusion of looking bigger while than you are.
A lean 20" inch arm is a big arm especially if you're talking no pump but flexed. Let's put this into perspective @rutman posted a pic a few pages back and I'm sure he's probably rocking 20+ish cold arms and you see how big he is. While he's still lean he's not shredded so you've got to be rocking 21+ inch guns off season to see a 20" ripped arm.
You're close. I'm right under on the 20 mark cold... But when I was lean I was a solid 19 cold.
A 20in lean arm is truly massive...
I hope everything goes great with your injury. I know all too well how set backs are. You'll be back better than ever! Well rested and primed for some major growth! [emoji123]