<center>'''What is the most likely diagnosis?'''</center>
<center>'''What is the most likely diagnosis?'''</center>
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A circular crusted lesion was found on the abdomen of a dog. The owner reports the lesion was a small red bump yesterday, and today there is this crusted lesion.
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Shown below is the presenting lesion in a bird from a group with several affected individuals. What is the most likely differential diagnosis?