I'm not overweight, but my stomach sticks out?
So, one main flaw in my body I've always wanted to improve on is my stomach/gut area. My abdominal area is fine, and I know it's not due to bloating as I don't deprive myself of water. I've also been doing about 20 minutes of abdominal exercises every other day for the past couple of months which has improved it slightly, but I always seem to have an awkward bump, and it makes me feel very self conscious. It's also been there at any weight I've been (110ibs to 140ibs), so it's not just fat as far as I know. I injected a lot into my stomach as a kid due to type 1 diabetes, and overused that injection site, so my doctor said it could be just tissue build up, however I've not used that area for a good 3-4 years.
Is there anything I can do to improve this area, are there any exercised/diet tips which could help improve my lower stomach? I'd really like to be able to have a nice flat stomach for once, (some ab appearance wouldn't be unwelcome either :P ) but I'm just not quite sure what to do. I'm guessing if I lose a little more weight it will help to an extent but it've never really been one to show off my belly, I always feel like I'm having to constantly hold it in.
Help? Thank you :)