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Alpaca (case no. 1), ear pinnae. Evolution of skin lesions from severe crusting dermatitis, hyperkeratosis, focal ulceration, alopecia, and scaling (a) to moderate to severe crusting, hyperkeratosis, scaling, erythema and alopecia (b) to mild to moderate alopecia, erythema and scaling (c) to mild alopecia and erythema (d).
