658 DISEASES OF THE SKIN. 



and hcemorrhages, skin diseases may be arranged into three or 

 more groups. 



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



Class I. — Inflammations. 

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



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

 — comprehending papulatum, nodosum, strophulus, 

 squamosum, pityriasis, fur/uracea, membranacea, 

 rubra. 



(2.) Herpes (simplex and zoster). 



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

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



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

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

 odes, as furunculus, anthrax, Aleppo tubercle). 



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



Group IL — Eczematous inflanmiations (allied to eczema). 



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

 lichen simplex, and prurigo ; E. vesicular e ; E. rubrum ; 

 E. pustulosum — comprising impetigo sparsa, figuratis, 

 and pilaris; E. lichen; E. squamosum; E. pityriasis), 



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



(3.) Ecthyma — (a), simplex; (b), chronicum, rupia ; (c), 

 gangrenosum. 



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

 (lepra), gyrata, conjluens). 



Group III. — Ulcers. 



(1.) Idiopathic. 

 (2.) Sympathetic. 

 (3.) Constitutional. 



Class II. — New Formations. 



Group I. — Homologous I^ew Formations. 



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



clavus, ichthyosis, cornucutaneum). 

 (2.) Pigmentary {lentigo, ephelis, moles, melanosis, chloasmat 



silver stain, leucopathia). 



