Thanks for contacting us with your bunny question.
There are several conditions that could result in a circular hairless area including trauma, bacterial skin infection,fungal skin infection (ringworm),and mites, among others. A physical examination, likely with some further skin diagnostics is advised to diagnose your bunny’s condition and determine the best treatment. At home treatment without a diagnosis is not advised.
Please contact us as soon as possible so we can find an appointment time that is convenient for you to bring your bunny to meet us. Best Regards, Dr. Peter Helmer – 813 973-8566.