This. Exactly. I've been watching this thread and wanted to share what I've found. I suffer from post nasal drip with a deviated septum. I was having these scabs like clockwork, once every 10 days. I'd seen multiple ENTs and no one was able to help. When I ate fatty foods (dairy, avocados, fried foods, etc.) it made the problem worse so I avoided them as much as I could. That made sense to me – there's a correlation between what I eat and how much mucus my body produces. @moreinfo you mentioned dry air. I concur 100% x 1000. I'm used to sleeping with a fan – pointed at my face. As soon as I forced myself to go without (back in July), the scabs have almost completely stopped. I've only had one in the past 4 months. The post nasal drip is still there, but I'll take that over the scabs any day. In my case, I believe these scabs are a "mechanical" problem vs. an infection or illness. If you're reading this, I don't know if this will help you. But I hope it does.