This week’s edition of the Step 1 Question of the Week is about musculoskeletal. See if you can answer the question and then watch the video to learn the correct answer as well as the rationales for each option.
A 6-month-old Chinese child is brought to the clinic for a checkup. He has been developing well. Physical examination reveals the findings shown, which were also present at birth.
Which of the following is the most likely etiology of the skin lesions in this patient?