Symiitonis. Course. Treatment. 89] 



which the swelling of the skin and its tenderness are far greater. 

 This circumstance is perhaps explained by the fact that in the 

 skin of the dog- the hair follicles are arranged gronp-wise ronnd 

 a common dnct, and that on this account several hair follicles 

 and sebaceous glands are always affected at the same time. 

 Suppuration of the hair follicles or sebaceous glands is noticed 

 much oftener in dogs. 



In sheep and swine the clinical form of the affection appears 

 to be similar to acne of the horse. 



Course. In many cases, for example in the horse, the acne 

 nodules, usually after previous vesicle formation, disappear in 

 1 to 3 weeks without leaving any trace, or suppuration takes 

 place and little bald spots are presented to one's ol)servation. 

 Since in both cases fresh nodules are often formed, in the mean- 

 time, in the surrounding area, the course of the affection be- 

 comes prolonged and even chronic. If suppuration takes place 

 the perifollicular connective tissue becomes involved in the i)ro- 

 cess, and then little abscesses arise which extend into the sub- 

 cutaneous connective tissue, coming in contact and frequently 

 communicating with each other. Finally, however, cure results 

 here also by scar formation. Sometimes these abscesses do not 

 ])reak, and pea to pigeon egg-sized hard nodules may then per- 

 sist in the skin for a long time. Finally the process may lead 

 to the formation of socalled tallow cysts (molluscum atheroma- 

 tosum, Schindelka) which arise from the cyst-like dilatation of 

 the sebaceous glands, the walls of which are much thickened and 

 are filled with a fatty rancid mass. They form likewise hard 

 swellings in the skin and may attain the size of a pigeon 's es^^. 



Treatment. The causes of the disease so far as they may 

 be discovered should be removed, and if possible the horses 

 should be kept from work ; under such conditions cure frequent- 

 ly results in horses without any further treatment. At first 

 gentle washing with disinfecting solutions seems to be useful, 

 while the employment of tar preparations is contraindicated ; 

 the internal use of ichthyol with water or Fowler's solution 

 (ichthyol, dist. water or Fowler's solution in equal parts; 5 to 

 20 gm. for the horse, 10 to 20 drops for the dog) may do good 

 service (Schindelka). Salicylic ointment is used to advantage 

 in the incipient stage (5:100) (Midler). Later on the dilated 

 nodules are pressed out, perhaps after previous splitting with a 

 pointed knife or opening with Paquelin's thermo-cautery 

 (Frick), and the resulting wound and its neighborhood is care- 

 fully washed and dressed with any disinfecting fluid (tincture 

 of iodine 5%, pyoctanine solution 1:1,000, corrosive sublimate, 

 etc.). 



The before mentioned follioulitis of the non-hairy parts of the bouy in 

 horses was intliienced by treatment only insofar as the tenderness was lef-seneil 

 after washing with Burow's solution, and no fresh crops of vesicles occurred after 



