Actually Chunky is right. There is no such thing as spot reduction. I can have this confirmed by the trainers at my gym. All 7 of them, because this question comes up a lot.
This is a common misconception. Yes, you work an area and you see the muscle, but that does not mean the fat in the area is being used up. Your body first has to brun through the carbs you have stored, then when the store is depleted it turns to the fat to break it down to create energy.
Also, as stated before, you are young. There still might be some, I have a feeling I am going to get backlash from this, baby fat, but "Hi" I'm 21 so save it.
If it really on your mind, up the cardio. Just be careful, because if you lose too much you can look sickly. Don't be surprised though if it comes back, it might just be in your genes.