946 



Scabies. 



flammation, and especially the moist surfaces, are characteristic, 

 in contrast to the dry crusts and dry skin surfaces in scab. 

 Ring-^vorm is recognized by the round, gray or yellow coherent 

 crusts and by the fact that the hair falls out in round patches. 

 In view of the diversity of the parts of the body which are 

 first attacked, the differentiation of the three forms of mange 

 from one another can only present difficulties in very old cases, 

 although the dermatophagus scab never attacks the whole body. 



Treatment and Prophylaxis. After careful cleansing of the 

 skin, and if possible after clipping of the hair, the following 



Fig. 143. Sarcoptic scab 



remedies may be employed best in fluid form, and applied 

 at most to one-fourth part of the body: 57^ creolin-, lysol-, 

 or lysoform solution; naphthalin ointment (1:10); creosote (1 

 part to 10 parts of alcohol or 15 parts of water, or 1 part of 

 creosote to 15 parts oil) ; petroleum (with 3 parts of water or an 

 indifferent oil), 5% tobacco decoction, perhaps also sulphur oint- 

 ment (1 part to 4-5 parts of fat) ; all of these applications must 

 be washed off with soap and water after 3 days. In North Ameri- 

 ca the treatment by dipping is frequently employed (Hickman). 

 Mercurial and arsenical preparations are generally to be avoided, 

 as they easily cause poisoning. Finally the dermatophagus scab 



