Diseases of the Skin.— External Parasites. 205 



tumefaction of the skin where they had been placed ; in 

 forty-eight hours the follicles contained a purulent fluid, in 

 which young and adult acari and ova could be perceived. 

 The eruption extended; but eventually the parasites 

 disappeared, and a spontaneous cure took place."* 



Symptoms. — These likewise are not so easy of distinction 

 as in sarcoptic mange. At first, circumscribed tumefac- 

 tions of the skin take place : these tumefactions are hot, 

 and usually blotchy, or patched with red. In a very short 

 time small pimples make their appearance, which rapidly 

 become pustular, break, and exude serum, or, in severe 

 cases, pus. The matter thus exuded forms scabs, or crusts 

 — the skin is thickened and chapped as in common mange. 

 The itching attendant on follicular mange is not excessive 

 nor continuous. The disease usually commences on the 

 head, and from thence extends to the body ; it is of long 

 duration, and very obstinately yields to treatment. 



Detached hair is rarely replaced, owing to the destruction 

 of the hair follicle. 



Treatment. — The difficulty experienced in reaching the 

 acari renders curative measures somewhat troublesome and 

 unsatisfactory. Mercurial agents are, perhaps, the most 

 useful. White precipitate, combined with sulphur and 

 whale-oil, is a very excellent formula. 



The following ointment (my ©wn prescription) has been 

 in my practice attended with the best results in cases of 

 follicular mange. 



Acid, Acetic 1 , , 



01. Terebinth |«« 2 drachms. 



01. Tar i ounce. 



Ung. Hydrarg i 



Sulphur 8 ounces. 



Whale-oil 10 „ 



* Fleming's " Veterinary Sanitary Science," vol. ii. p. 457. 



