DISEASES OF THE &K1N. 



661 



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

 tions of tho cuticle, resembling an enlarged papilla of the skin. They 

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

 slight ulcerations on their summits. 



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

 or laminae, in which the epidei'mic cells are morhidly adherent, hard, 

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

 papilla, i:.ed elevations, or larger deep-red and dry surfaces. 



Order 3, Rashes. — Exanfhemata are composed of varioiisly formed,, 

 irregular sized, superficial red patches, which disappear under pressure, 

 and terminate in desquamation. 



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

 a large portion of the cuticle heing 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, which may or may not be fol- 

 lowed by a cicatrix. 



Order 6. Vesicle^. — Vesieulce, small acuminated or orbicular ele- 

 vations - of the .cuticle, containing Ijonph, which, at first clear and 

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

 are succeeded by a ecurf or a laminated scab. 



Order' 7." TuBEROULEs. — TubercuJce, small, hard, indolent elevations 

 of the skin, sometimes suppurating partially, sometimes ulcerating at 

 their summits. 



Orders. Spots. — Maculm are permaneufdiscolorations^or^ stains 

 of some portions of tKe skin, often with a change of structure. Thoy 

 may be whitish, dusky, or dark. 



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

 two others, namely, those which depend upon the presence 

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

 tively Dermatozoa and Dermatophyta. His classification is aa 

 follows : — 



