SKIN" DISEASES. 279 



ECTHYMA, 



Which consists of large, prominent, well-defined, and 

 isolated pustules, is rare. The pustules burst, produce a 

 dark -colored scab, which, when shed, leaves a brown stain. 



Fig. 124. Ecthyma. 



The disease is liable to be mistaken for small-pox. Treat 

 as for nettle-rash. 



PEMPHIGUS 



Consists in watery bladders, which appear in all parts 

 of the body. In severe cases the bladders may contain 

 pus and blood. They differ in size. Some are as large 

 as a hen's egg. They usually appear and disappear rap- 

 idly, sometimes in a few hours. The chronic form, how- 

 ever, may last for months. The bladders burst, or possi- 

 bly dry up without bursting. Scabs form, which, when 

 shed, reveal a red spot. 



Remedy. — Open bladders. Gentle purge ; then alka- 

 lies. Apply astringent powders, such as starch or the 

 oxide of zinc ointment. 



Boils (Furunculus) are caused by intense localized 

 inflammation, involving the subcutaneous areolar tissue 

 and leading to death of a part of the structure, which 

 is expelled as the 'core.' Poultices and fomentations, as 

 in man. Ordinary boils may be left to nature. 



