A college student is brought to the student health center at the urging of his roommate. He has been missing class because he needs to check the room lock many times before he can leave. Once he stas to ride his bicycle to class, he frequently returns several times to lock the door. He repeats this ritual every morning and often when he leaves the house. He misses his appointments and his academic performance suffers. His hands are chafed. Which of the following is the most likely diagnosis?