THE SKIN 



251 



affected animal rubs them off. Galleries are formed within the skin, 

 and this also adds to the irritation. The accumulated dry scabs break 

 and damage the hair more or less, which falls, leaving the parts affected 

 practically hairless. The irritation causes inflammation, and this 

 results in fibrous proliferation and thickening of the skin. The thick- 

 ened, leathery skin loses its pliability and becomes fissured or cracked. 

 In long-continued cases the animals become emaciated. 



Symptoms. — Intense pruritus, especially around the ears and eyes, 



Fig. 59. Case of advanced hog mange showing wrinkled condition of 

 skin. (Farmers' Bull. 1085, Dept. Agri.) 



and the finding of papules, vesicles, and scabs are the first evidences 

 of scabies. Later there is depilation and thickening of the skin, with 

 the accompanying rhagades. The disease will probably affect all the 

 swine that have been kept in one lot. The finding of the parasite is 

 positive evidence upon which to base a diagnosis. 



Treatment. — Sarcoptic mange may be successfully treated by the 

 use of the lime and sulphur dip or nicotine dip, repeating every ten 

 days for three dippings, provided that the quarters are cleaned and 

 disinfected and the thick scabs are removed so that the dipping solu- 



