It sounds like your Bearded Dragon has started to undergo his first shedding. This shedding will occur periodically (as often as every 6-8 weeks) as your dragon grows and will shed less often as adults. Other signs of shedding are pale skin and loss of appetite. Normally dragons become very agitated as they shed, and will often run around their enclosure and rub up against their cage furniture. To assist your dragon you can try soaking him in warm water.