CHAPTER XCI 



PYOGENIC DERMAL INFECTIONS 



Preliminary remarks — Pyogenic infections : The pyoses — The pyogenic folli-. 

 cuhtes — The pyogenic dermatites — References. 



PRELIMINARY REMARKS. 



In this chapter we begin a brief review of the more important skin 

 diseases of the tropics. As this Manual is not a work on skin diseases, 

 but is intended for the tropical practitioner, we have arranged these 

 disorders from the standpoint of the practical physician, and have 

 avoided a scientific classification. The chapters include pyogenic 

 infections; fungal diseases, with the mycetomas considered 

 separately ; the dermatites due to plants; ulcers; the dermatites 

 caused by animals; disorders of sweating and of nutrition; and 

 miscellaneous and cosmopolitan diseases. 



PYOGENIC INFECTIONS. 



The skin diseases which we gather together under this heading 

 are all caused by the pyogenic cocci, and may be distinguished as 

 follows : — 



A. Skin between the primary lesions not inflamed: — 



I. Non-follicular — The Pyoses. 

 II. Follicular — The Folliculites. 



B. Skin primarily inflamed — The Pyogenic Dermatites. 



THE PYOSES. 



Definition. — A pyosis is a non-folHcular dermal infection char- 

 acterized by the appearance, on apparently healthy skin, of 

 vesicles or bullae, the contents of which rapidly become purulent. 

 It is not associated with general symptoms, except shght fever 

 in the early stages at times, and is due to the action of pyogenic 

 micrococci. 



Remarks.— The type of this variety of dermal affections is 'Pyosis 

 mansoni/ named in honour of Sir Patrick Manson, G.C.M.G. 



Varieties. — A number of ' pyoses ' are known to exist in the 

 tropics, and these may be differentiated from one another as 

 follows : — 



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