CLASSIFICATION. 663 



and hcemorrliages, skin diseases may be arranged into tliree or 

 more groups. 



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



Class I. — Infiammations. 

 Group I. — Simple inflammations (allied to simple dermatitis). 



(1 .) Erythema — (a), simplex; (h), muUiforme; (c), chronicum 

 — comprehending papulatum, nodosum, stropUuliis, 

 squamosum, pityriasis, fui'furacea, memhranacea, 

 rubra. 



(2.) Herpes {simplex and zoster). 



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

 kinds of food ; from uterine affections, or persistent). 



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

 bite ; or symptomatic, as of erysipelas ; or plilegmon- 

 odes, SiS furunculus, anthrax, Aleppio tubercle). 



(5.) Pemphigus (benign, persistent, and foUaceous). 



Group II. — Eczematous inflammations (allied to eczema). 



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



lichen simplex, and prurigo; E. vesiculare; E. rubrum; 



E. pustulosum — comprising impetigo sjKirsa, figuratis, 



andptilaris; E. lichen; E. squamosum; E. pityriasis). 

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

 (3.) Ecthyma — (a), simp)lex ; (b), chronicum, rupiia ; (c), 



gangrenosum. 

 (4.) Psoriasis {punctata, guttata, nummularis, circinata, 



(lepra), gyrata, confliiens). 



Group III. — Ulcers. 

 (1.) Idiopatliic. 

 (2.) Sympathetic. 

 (3.) Constitutional 



Class II. — New Formations. 



Gkoup I. — Homologous ]!S!"ew Formations. 



(1.) Epidermic (epitheKal growths, comprising callosities, 



clavus, ichthyosis, cornucutaneum). 

 (2.) Pigmentary (lentigo, ephelis, moles, melanosis, chloasma, 



silver stain, leucoj)athia). 



