Lupus erythematosus scars occasionally become the seat of skin cancers. Dubreuilh and Petges* have collected all of the cases reported in addition to recording two of their own. In practically all of the patients the lupus had existed for many years, and the neoplasms originated upon the scar tissue. So far as can be judged from the rapidity of their growth, they were of the spinous-celled variety. More recently Janeway* has recorded another case occurring after the use of carbon dioxide snow. Gottheil, in discussing this case, held that previous x-ray treatment was probably the true factor.