Review Question - QID 214962

A 27-year-old man presents to his primary care physician with concern for a rash and itchy skin for the past 3 years. He states that at times his skin can be itchy or painful, and he has noticed small nits or mites in his arm hair. The patient has tried many treatments including hot baths, petroleum jelly, and shaving his hair but states that this has not relieved his symptoms. He has seen another primary care physician who tried several treatments but was unable to treat his symptoms. He has no other significant past medical history and takes no medications. His temperature is 97.9°F (36.6°C), blood pressure is 120/81 mmHg, pulse is 82/min, respirations are 12/min, and oxygen saturation is 98% on room air. Physical exam is notable for normal skin tone without any notable erythema, blisters, or macules. The patient points to a part of his arm where he states there are small insects or organisms; however, on exam it appears to be coiled body hair. Which of the following is the most likely diagnosis?