Has anybody had experience of the following situation please. For about a year one of my rosellas has had a small nodule on the top of its foot (end of the tarsus). It did not cause any problem and I was not worried about it. Suddenly in the last three weeks it has swollen rapidly to the size of a large pea, and affects some perching postures of the bird. My vet took a biopsy, but there is nothing conclusive about what it is or what has caused it. If anybody has had a similar experience, I would be grateful for any information which might help to resolve the problem.