A 45-year-old man is referred for evaluation of a neck rash that started approximately 2 years ago. He works as a roofer, smokes cigarettes, and frequently experiences sunburns. What is the most likely diagnosis?
A 3-month-old baby is brought to the clinic for assessment of an ulcerative lesion on her left labia. Her parents state that she was born with a birthmark at the ulcer site, which has rapidly changed over the past 3 weeks and occasionally bleeds. Can you make the diagnosis?