Relation of skin diseases with disorders of internal organs

Real dermatology, or the teaching of dermal and venereal diseases, was not founded until the 18th century by the English physician Willan, who lived from 1757 until 1812. He was the first to divide skin diseases according to their morphological features. The second founder of our special discipline was the French physician, Bazin, who lived in Paris from 1807 to 1808. In his manual he speaks of skin diseases caused by external causes and other, depending on diathesis and constitutional disorders; thus he already put some of these diseases in connection with external and partly with internal causes.