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Although far less common than warts, the presence of a hair ring also occurs due to homosexual behavior and group housing of young bulls. Accumulation of hair during riding and the continuous action of riding with extension and retraction of the penis serve to create a tight band of hair (Figure 19.5). Hair rings are typically identified during a BBSE and treatment is simply removal and application of a suitable ointment. Because the encircling ring may become sufficiently tight to cause pressure necrosis with damage to the urethra, careful examination to determine the depth of the lesion is warranted [6]. Small urethral fistulae will typically heal on their own, but those that are larger and more proximally located must be closed (Figure 19.6). In severe cases the constricting ring may cause avascular necrosis to the extent that damage to the dorsal nerves of the penis or sloughing of the entire glans penis can occur.

Figure 19.5 Penile hair ring.

Figure 19.6 Urethral fistula that is of a size and location to require repair.