A 9 year-old Labrador Retriever is being presented with skin problems for 2 years. The lesions start as oozing wounds on head, scrotum and rump. Some of them healed completely, others seemed to close and then opened up again. Treatment with antibiotics and corticosteroid creams showed no improvement. For some time the owners have now seen granulomatous and crusty lesions around the eyes and at the same time a bilateral uveitis anterior was diagnosed. A short time later, a progressive depigmentation of the planum nasale with crusty and partially ulcerative lesions and a severe crusty dermatitis of the scrotum was seen. The dog additionally shows shifting and intermittent lameness.
Which differential diagnoses are less important in your eyes?
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