Congratulations to the winner of our April quiz, Ayesha Yacub Moolla, MBChB, Department of Dermatology, University of Stellenbosch and Tygerberg Academic Hospital, Cape Town, South Africa. The correct answer to our April challenge was dermatofibrosarcoma protuberans (DFSP), pigmented variant (Bednar tumor). For a complete discussion of this case, see the Off-Center Fold section in the May Archives (Quigley EA, Marghoob AA, Busam KJ, Chen C-SJ. A firm red-brown plaque on the arm. Arch Dermatol. 2009;145[5]:589-594).
Be sure to visit the Archives of Dermatology Web site (www.nmr.mgh.harvard.edu/martinos) to try your hand at the interactive quiz. We invite visitors to make a diagnosis based on selected information from a case report or other feature scheduled to be published in the following month's print edition of the Archives. The first visitor to e-mail our Web editors with the correct answer will be recognized in the print journal and on our Web site and will also receive a free copy of The Art of JAMA II.