If you've gained 15 lbs and are wearing the same pants - it probably isn't fat.
Biceps - many people have issues getting solid growth from them. Chin ups, heavy BB curls, etc., will help, but there is no single cure-all. If there were - we'd all have huge biceps.
Your back exercises involve the biceps. Larger triceps make the upper arm larger as well.
Since you don't say you notice the difference, maybe there is growth. Did you have starting measurements? Do any of the people that you know notice a change? 15 lbs on your frame is like a 7% gain - so that is pretty substantial - don't be discouraged.
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