This is an immune mediated disease of unknown origin. It appears as nodules and ulcerations on the head and body. It is a diagnosis of EXCLUSION. Differentials include tumours, eosinophilic furunculosis, bacterial, fungal and mycobacterial infection. These are excluded by culture and histopathology. Mycobacterial PCR is usually negative but false positives from contaminates can occur. Responds well to short term corticosteroids and cyclosporine maintainence
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