Have you reviewed your set up on here with the list of questions ? If not, that would help a lot so others can suggest improvements if needed and try to sort out what may be wrong. His suggested feeding depends on his age (if it should be more bugs or vegies). Temps and lighting play a huge roll in eating and metabolism as well. Beautiful Dragons has a great listing of things to feed your dragon along with a lot of other helpful information.
http://www.beautifuldragons.com
Good veggies and insects such as crickets, dubia roaches, silk worms and phoenix worms are all good choices. Don't feed mealworms. My vet, this site, and breeders will pretty much feel the same on this issue. He may be too young yet to have much interest in veggies. When juveniles they eat 90% insects to about 10% veggies, and that generally reverses when adults to be 90% veggies and 10% insects.
He could just be starting to shed. They often shed in just patches, not always their whole body all at once.
If he's young, baths daily to every 2-3 days at most is recommended. This helps keep then
hydrated as well as encourages them to poo. It is not unusual for an adult dragon to go a few days between poos. Adults should have a
bath 2-3x per week.
How old is your dragon?
How long have you had your dragon?
How long is your dragon?
What is the sex of your dragon?
What size enclosure do you have your dragon in?
What type substrate do you have on the bottom of your tank?
Do you use UVB lights?
If so, Is it a coil, compact, fluorescent tube, or Mercury Vapor bulb?
What is the brand name and number of your bulb? Wattage (if MVB)?
How old is your
UVB bulb?
How close can your dragon get to the UVB?
Do you use a separate basking bulb? What kind and what is the wattage? Is it a white or colored bulb?
What are the basking temps?
What is the cool side temp?
Do you take the temps with a stick on thermometer, a digital thermometer with a wire and a probe end or a temp gun?
Where exactly are you taking your basking temps?
Do you use a heat rock or heat pad?
What do you feed your dragon? Please be specific.
How often do you feed and what time do you feed (morning, afternoon, night)?
Do you gutload (feed) your crickets, worms, etc?
Do you use vitamin or calcium supplements? What brand(s)? How many days a week do you use each of them?
Is your dragon having regular bowel movements (poops)?
Do you
bath your dragon? How often?
Do you mist your dragon or offer water other than in the
bath?
Have you gotten a vet check and fecal done?
Does your dragon share an enclosure with another dragon?