Meant to say, what are your stats?
Chances are, you probably simply need to focus on how well you are stimulating the arms while training them, rather than going on a specialisation phase (something usually only advanced lifters do).
Also, chances are (as is the case 90% of the time) you probably need to bring everything up...and arms are as big as they can be for a small size all over. No use complaining that your arms are only 14" when at average height you only weighed 160lbs lol.
If all those are true ^, you just need to put your head down (be consistent) and get the bodyweight/strength way up.