An 83-year-old man presents to his urologist's office with ""problems down there."" He is a poor historian, but his wife accompanies him and helps with details of the history of present illness. She does not report that he has any voiding issues and reports that he has never had to see a urologist before now. Further genitourinary review of systems questions is suggestive of phimosis.
What physical examination finding would support this diagnosis?