52 Eosinophilic folliculitis and furunculosis
Canine eosinophilic furunculosis is an uncommon condition with an acute onset. It is usually confined to the nose and the muzzle, although it can occur on the pinna and the trunk. The severity of the lesions varies and many dogs will exhibit signs of pruritus. In most cases, it is thought to result from an acute hypersensitivity reaction to arthropod antigens. The condition is similar to mosquito-bite hypersensitivity in cats.
A physical examination revealed enlarged submandibular lymph nodes, but all other parameters were within normal limits. Multiple nodules, some with an ulcerated surface and some with a haemorrhagic crust, were present on the bridge of the nose (Fig. 52.1). The dog resented examination of this site. None of the other sites were affected in this case.