My great grand daughter (5 yrs old) has and infection on the last joint of her middle finger. It has big lesions of pus and is swollen and very red. One of them was so big they popped it to let some of the pus out and so it wouldn t hurt quite so bad. The doctors in Phoenix, AZ have not been able to identify what is causing this to happen. She had the same infection on another finger of the other hand about a year ago. She also had what looked like the same infection on her arm a few months ago, after she got a scratch at the playground. The doctors do put her on antibiotics and it finally starts looking better and goes away, but takes a long time. They are thinking it is an autoimmune problem. Pictures of her finger looked like something to do with cat fever to a friend, who is a vet assistant. I found a picture of Verruca Vulgaris that looked a lot like the picture I have. Any ideas? I appreciate your help. Dorothy L.