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Dermatophilosis. A. Tufted papules and annular areas of alopecia over the rump and sides of a horse.
(Courtesy D.W. Scott.)
B. Crusted papules and erythema on the muzzle of a horse. C. Skin biopsy from a calf shows large surface crust composed of thick alternating layers of hyperkeratosis (white arrows) and degenerate neutrophils (green arrows) parallel to the skin surface. D. Coccoid organisms forming branching filaments (“railroad tracks”) (arrows) within the surface keratin.
