972 



Acarus Mange. 



Ill the pustular form (Fig. 155) liempseed-sized firm 

 nodules, which subsequently change to pustules, develop in the 

 swollen and inflamed skin of the regions already mentioned. 

 Then the neck, the chest and the inner surface of the thighs and 

 other places are attacked. These often appear peculiarly bluish 

 red, and reddish pus or a tallow-like thick mass, containing 

 numerous mites in different stages of development, is evacuated 

 from them by pressure. The skin is arranged in thick folds 

 l)etween which it is intensely inflamed and appears covered with 

 many brown or more gray scabs, as well as with bran-like scales. 

 The hair falls out over the whole area that is covered with 

 scales or over the greater part of it (Fig. 155). 



Fig. 155. Acariasis in the dog with pustule formation and thickening of the skin. 



In this form also the itching is slight, or completely absent. 

 The surface of the unpigmented skin appears peculiarly copper 

 red (socalled red mange), the skin of the head a turkey or 

 warthog color. Through the presence of numerous thick crusts 

 and folds of skin it presents the appearance of a fissured tree 

 bark (Fig. 156). If in such cases intense itching is noticed, the 

 suspicion is aroused that sarcoptic scab is also present (Schin- 

 delka). In this case the frequent scratching and rubbing visibly 

 increase the inflammatory process and ulcers may arise in place 

 of the broken pustules, through which cavities in the subcu- 

 taneous connective tissue may be reached. At the same time 



