. American practice of surgery ; a complete system of the science and art of surgery . FiG. 53.—Epithelioma, Showing Rohed Border(Originah) SURGERY OF DISEASES OF THE SKIN. 375 posure to the weather, and Icucoplasia of (he tongue, which is attributed to theeffects of tobacco smoke. Some famiUes are more disposed to epithehoma than are others. This maybe due to some inherent weakness of the skin, that renders it more hable to theformation of senile patclies, which in turn sometimes give rise to Tig. 54.—Epithelioma of the Lower Eyelid. (Original.) Xeroderma pigmentosum—an affection
. American practice of surgery ; a complete system of the science and art of surgery . FiG. 53.—Epithelioma, Showing Rohed Border(Originah) SURGERY OF DISEASES OF THE SKIN. 375 posure to the weather, and Icucoplasia of (he tongue, which is attributed to theeffects of tobacco smoke. Some famiUes are more disposed to epithehoma than are others. This maybe due to some inherent weakness of the skin, that renders it more hable to theformation of senile patclies, which in turn sometimes give rise to Tig. 54.—Epithelioma of the Lower Eyelid. (Original.) Xeroderma pigmentosum—an affection which is apt to occur in famihes—maybe only a highly exaggerated instance of this innerent weakness. The great majority of epitheliomas occur on the face, and there are twoprincipal reasons for this. In the first place, senile patches occur most fre-quently on the face, and out of these, as before mentioned, epitheliomas readilydevelop. Then again there are many orifices in the face, such as the eyes, thenostrils, and the mouth, and around these, as localities having a comparativelydelicate covering and much exposed to irritation, epitheliomas tend to springup. (Figs. 53 and 54.) For clinical purposes one may divide the epitheliomata of the skin into: (1) Superficial epithelioma; (2) Deep or nodular epithelioma; (3) Papillary epithelioma. These divisions are not absolutely distinct, as they may run into one another; 376 AMERICAN PRACTICE OF SURGERY. but they do form a basis on which to build
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