[Skin manifestation of internal malignancy]

Relationship between malignant tumor of the internal organ and the skin can be classified as skin metastasis of the malignant tumor, non-specific skin manifestation of the malignant tumor and hereditary syndrome which tends to have malignant tumor. I, however, discuss here mainly about the non-specific manifestation of the malignant tumor by showing representative cases of the dermadrome. Such cases are acanthosis nigricans, Leser-Trélat's sign, dermatomyositis, atypical erythema, acquired ichthyosis, Sweet's disease, Weber-Christian's syndrome, phlebitis migrans and Bazex syndrome.