Is the gynecomastia with Propecia temporary?

[torontoguy88]

So, its been a little over 3 months of using Propecia. Saw myself today in the change room while trying on a shirt at the mall today and let me say that lighting is not a friend for someone who is losing/shedding hair . I've also noticed slight gynecomastia and still am not sure if it is the Propecia or because of weight gain. I gained about 10 pounds since last year ( I'm 5'10, 170lbs, 24 now). One thing that I noticed is that it's been much harder for me to lose weight. I haven't worked out since Summer time, but I do watch my calorie intake per day.
Either way, I'm wondering if the gynecomastia is temporary ? Meaning, will it go away down the road if I continue to stay on propecia? Or do I have to turn to working out to reverse the effect?