It is no exaggeration to say that in the continual progression of general medical knowledge in recent years dermatologic theory and practice have played no mean rôle.
Not only has there been a direct enlargement of the scope of dermatology brought about by the complex cutaneous reactions resulting from the constantly increasing flood of patented cosmetic and laxative preparations and from the introduction into industry of new chemical agents, but through valuable clinical research both here and abroad the therapeutic armamentarium has, in the aggregate, become finer and more accurate in recent years. For example, during the past five years, in private as well as in clinical practice, the gradual development of general knowledge concerning the practical importance of immune biologic processes as an aid in the diagnosis and logical classification of cutaneous diseases alone has revealed new vistas in dermatology—vistas that previously were unsuspected. The past five years of
SOHRWEIDE AW. RECENT CHANGES IN DERMATOLOGIC DIAGNOSIS: RESUME OF 1.112.050 PUBLISHED CASES. Arch Derm Syphilol. 1934;30(2):260–263. doi:10.1001/archderm.1934.01460140086014
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