MANGE. 



583 



ment of fifty diameters. When no pustules exist, we examine the 

 product obtained by scratching the skin or the roots of some hairs 

 pulled out for that purpose. 



The affections which maybe confounded with follicular mange are: 



1. Impetiginous eczema and traumatic or purulent dermatitis. 



2. Pustulous exanthema of distemper. 



3. Sarcoptic mange. 



4. Inflammation of the eyelids (blepharitis). 



5. Tonsurating scurvy. 



In the dog we frequently observe in the neighborhood of the 

 eyes, cheeks, and lips, rounded, depilated, confluent blotches, which 

 show altogether the objective characters of tonsurating scurvy : 

 redness, accumulation of dry scabs, and absence of pustules. 

 Microscopic examination shows that it is, in fact, the dry form of 

 follicular mange. We must, therefore, never neglect this valuable 

 method of forming the diagnosis — so much the more because we 

 may observe mixed cases in which follicular mange is associated 

 with other dermatoses. It has been seen, namely, to coexist with 

 sarcoptic mange (Siedamgrotzky), with tonsurating scurvy (Fried- 

 berger), with exanthema of the disease of young age, and with 

 sarcoptic mange upon the same animal (Frohner). 



Prognosis. Follicular mange must be considered as a very 

 serious disease. If spontaneous, cure is possible (Roll) ; it is ex- 

 tremely rare. There is no authentic instance of a final cure of 

 generalized mange, even when under treatment for months ; but 

 apparent cures, followed by a return of the trouble at a more or 

 less remote time, are not rare ; particular instances of this kind are 

 mentioned in our publications. 



Disappointments are very common, and we can only be certain 

 of having overcome demodectic mange after having kept a record 

 for months of dogs which are apparently cured. Even in cases 

 where it is localized, the prognosis must be reserved, for the treat- 

 ment (because of the manipulations which it necessitates) is one 

 cause of the extension of the trouble. At all events, it is proper 

 to advise the owner of the rebellious character of this acariasis. 

 In generalized follicular mange, except where animals of exceptional 

 value are concerned, it is mostly decided to sacrifice the patients. 



The progndsis also depends upon the constitution, temperament, 

 and idiosyncrasy of the patients, but we can only judge of its 

 influence by the effects of the treatment. 



