Page 1512 - Clinical Small Animal Internal Medicine

1450 Section 12 Skin and Ear Diseases

(a)
VetBooks.ir

(b)
Figure 165.2 Adult Demodex cornei.

Figure 165.1 (a) Adult Demodex canis. (b) Adult Demodex injai.
Source: Courtesy of Dr Linda Frank.

Demodex canis infestation can cause a variety of signs.
Lesions seen can include alopecia, erythema, scales, pap-
ules, and pustules. If hair follicles rupture (i.e., furuncu-
losis), severe inflammation associated with tracts
draining serosanguineous to purulent exudate is noted Figure 165.3 Juvenile‐onset generalized demodicosis caused by
Demodex canis. Diffuse alopecia, erythema, and edema are noted.
(Figure 165.3). Hemorrhagic crusts on the lateral aspect of the face correspond to
Lymphadenopathy and/or fever may occur in these areas of furunculosis.
cases especially if large areas of the body are affected.
Follicular casts and comedones are very typical lesions. the generalized form of the disease and may aggravate
Pruritus may or may not be present and is usually noted lesions, resulting in crusts, pustules, thickened skin,
when secondary infection or seborrhea occurs. Secondary and hyperpigmentation. Paws rarely are affected alone
superficial or deep bacterial infection is often present in and lesions can be similar to the ones described. Bullae