DISEASES OF THE SKIN. 



663 



ind hzmorrhagcs, skin diseases may lae arranged into tliree or 



more groups. 



Classification of Skin Diseases. — (De. Buchanan.) 



Class L — In/lammatiovs. 

 Caoup I. — Simple inflammations ^allied to simple dermatitis). 



^1 ) Erythema — {a), simplex; (6), muUi/orme ; (c), chronicum ' 

 — comprehending pajntlatum, nodosum, strophulus, 

 8qttam,osum, pityriasis, furfuraceay membi'anaeea, 

 rufira. 



(2.) Herpes {s'tanpleT" and zoster). 



(3.) Urticaria (idiopathic, from indigestion of particular 

 kinds of food ; from uterine aff'ections, or persistent). 



(4.) Dermatitis (idiopathic, as from bums, or from frost- 

 bite ; or symptomatic, as of erysipelas ; or phlegmortr. 

 odes, &a furunadus, anthrax^ Aleppo tubercle). 



(5.) Pemphi(rus (benign, persistent, and foliaceous). 



fQnoUP XL — Eczematous inflammations (allied to eczema). 



(1.) Eczema (erythematodes ; E. papulosum — comprising 

 lichen simpler, and pnXriyo ; E. vesiculare ; E.rubrum; 

 E. puatulogiun — comprising impetigo sparsa, Jiguratis, 

 anA pilaris ; E. lichen; E. squamosum ; E. pityriasis). 



(2.) Acne (comprising A. sivxiilex ; A. pilaris ; A. rosacea). 



(3.) Ecthyma— (a), simplex; (6), cTironicum, rupia ; (c), 

 gany^'enosttm. 



(4.) Psoriasis {puuetata, yiittata, nummular ij, ^cirdrMfOfl 

 (lepra), gyrata, conftutfut). 



[Gropp II [. — Ulcers. 



(1.) Idiopathic. 

 (2.) Sympathetic. 

 (3.) Constitutional. 



CLAsa li. — Ne^ip Formations,^ 

 CrROUP T. — Homologous Kew Formations. 



(I.; Epitlermie (epithcUal groAvths, comprising eallosities^^ 



clnvvs, ichthyosis, eomucutaneum). 

 (2.) Pigmentary (lentigo, ephelis, mol&Sf melanosiSt chloasma^ 



silver stain, leucopathia), 



