The document describes contagious ecthyma, or orf, which is clinically diagnosed by the presence of eroded plaques on the teats and udder of sheep and around the mouths of suckling lambs. The lesions appear as erythema, vesicles or pustules that rupture and form thick scabs, leaving a horseshoe-shaped ring of small scabs surrounded by a wart-like granuloma. Treatment involves removing scabs and applying emollient cream before milking and an astringent solution after milking.