656 DISEASES OF THE SKIN. 



Order 1. Pimples. — Papulce are simple, solid acuminated eleva- 

 tions of the cuticle, resembling an enlarged j:?api7Zrt of the skin. They 

 commonly terminate in a scurf, and sometimes, though seldom, in 

 slight ulcerations on their summits. 



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Order 2. Scales. — Squamce consist of cuticle in patches, plates, 

 or laminae, in wliich the epidermic cells are morbidly adherent, hard, 

 thickened, whitish, and opaque. These scales cover either small 

 papillae, red elevations, or larger deep-red and dry surfaces. 



Order 3. Eashes. — Exanthemata are composed of variously formed, 

 irregular sized, superficial red patches, which dis-appear under pressure, 

 and terminate in desquamation. 



Order 4. Blebs. — Biillce. These differ from vesicles in their size, 

 a large portion of the cuticle being detached from the skin by the 

 interposition of a watery fluid, usually transparent. The skin is red 

 and inflamed underneath the blister. 



Order 5. Pustules. — Pustulce consist in circumscribed elevations 

 of the cuticle, and contain pus. They have red and inflamed bases, 

 and are succeeded by an elevated scab, wliich may or may not be fol- 

 lowed by a cicatrix. 



Order 6. Vesicles. — Vesiculce, small acuminated or orbicular ele- 

 vations of the cuticle, containing lymph, which, at first clear and 

 colourless, may become amber-coloured, opaque, or pearl-like. They 

 are succeeded by a scurf or a laminated scab. 



Order 7. Tubercules. — Tuherculce, small, hard, indolent elevations 

 of the skin, sometimes suppurating partially, sometimes idcerating at 

 their summits. 



Order 8. Spots. — Maculce are permanent discolorations or stains 

 of some portions of the skin, often with a change of structure. They 

 may be whitish, dusky, or dark. 



Dr. Bennett has expunged Bidlcc from these orders, and added 

 two others, namely, those which depend upon the presence 

 of parasitic animals and plants, and wdiich he calls respec- 

 tively Dermatozoa and Dcrmatophyta. His classification is as 

 follows : — 



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