So why are my arms not getting bigger?

Anonymous
So why are my arms not getting bigger?
First pic is me beginning of 2015
So why are my arms not getting bigger?


Second pic is me November 2015

Started working out over a year ago. I went from scrony to lean and somewhat muscular id say 7-8% boyfriend. But I'm kinda disheartened becUse I've put in work 4-5 days a week and my damn arms won't get bigger. Anyone have any idea of what workout and eating routines I should try? By the way here's a progression pic over a year.. I'm pretty dedicated just can't get bigger arms.

So why are my arms not getting bigger?
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