^90 



Acne. 



The apparently sound skin in the immediate neighborhood 

 is slightly swollen, only if the disease is rather severe, it becomes 

 warmer, sensitive to pressure and harder, and the nodules them- 

 selves become much harder (Acne indurata). Slight itching is 

 generally noticed in the stage of development and healing; but 

 there is more tenderness than itching. 



On the hairless or sparsely haired parts of the skiu of the horse (sheath, 

 inner surfaces of the thighs and fore extremities, lower belly, chest) Schindelka 

 saw a peculiar folliculitis which commenced in small areas with the appearance of 

 millet sized or somewhat larger nodules. The nodules are at tirst palpable, deep in 

 the !-kin, later on they become prominent on the surface of the skin, some of them 



Acne nodes on the bridge of the nose of a doij 

 Schindelka.) 



(After 



change to pustules in 3 to 4 weeks, and after they burst, roundish ulcers develop 

 with elevated edges. These heal gradually, leaving behind cicatrices, round about 

 which fresh nodules are formed. (Some nodules, however, dif^appear after several 

 weeks without previous suppuration. In exceptional cases acute swelling of the 

 lymph vesi-els and lymph glands occurs. The diseaKe may last for months. The 

 development of folliculitis was always preceded by influenza. A similar disease was 

 seen by Marek on the anterior surface of the forearm of a horse which had not 

 previously been attacked with influenza. 



In dogs acne is principally characterized by the prominence 

 of inflammatory symptoms, especially if the eruption is on the 

 bridge of the nose (Fig. 127) or on the face, in consequence of 



