Congratulations to the winner of our October quiz, Edidiong C. N. Kaminska, MD, Section of Dermatology, Department of Medicine, University of Chicago, Chicago, Illinois. The correct answer to our October challenge was primary umbilical cutaneous endometriosis. For a complete discussion of this case, see the “Off-Center Fold ” section in the November Archives (Bronfenbrener R, Shraga A, Mehregan DA. Umbilical nodule in a 32-year-old woman. Arch Dermatol. 2011;147:1317-1322).