Hi there,
Yep, unfortunately we all have to deal with losing fat in the chest area when we might not want to. What are you doing for exercise right now? If you're not weight training, you should be. Not just the chest, but for all your muscles. Specifically for chest a good variety of exercises with heavy weight, such as bench press, dumbbell presses, flyes are great. Body weight exercises such as dips and push ups are great too. You can also do you bench presses, flyes and DB presses on a flat bench, an incline bench and a decline bench. Just make sure to give your muscles at least 48 hours in between workouts.
Sarah