I have been getting these sores on and inbetween my fingers. They start out itching, then unknowly I start to scratch them forming into blisters. They eventually pop and turn into sores until eventually they go away. Then it starts all over again. I don't know what causes them but they don't look nice. I try to hide my hands because it seems embarassing. Mostly, these sores appear on my right fingers and then a lessor amount on my left fingers. I also have noticed when I extend my fingers, the one next to my pinky is bent. I have to use more force to straighten them out. There is also a larger sore on that finger. Could it be a form of an auto-immune disease as I do have fibromyalgia and my blood test showed that my rheumatoid factor is elevated.