Amber wheezes EVERY single time she is close to shedding. I'd bet that really all it is. They tend to rub their heads against things a lot while they are in shed, so I would think the skin on their nose is the first to start to go. My bp rubs her head on things during shed so much that she'll dent one of her eyecaps in the day or so leading up to the shed.

Also, if you want to look into a product that will end soaking sessions or assisted sheds, check out the DIY humidifier OR better yet, spend 30 bucks and get a product called a Tropical Air Exchange from ReptileDirect.com. I used it the last time Amber went into shed, and I got a perfect, one piece shed. That had never happened before I used the humidifier.