A 61-year-old man with a history of liver transplantation, heart failure, poorly controlled diabetes mellitus, and recent hip fracture presents from his nursing home with a rash. He was living independently until 6 weeks ago, when he fell and fractured his hip. He had a prolonged period of post-operative immobility, but is now starting to ambulate. About 3 weeks earlier, he had a pruritic rash on his groin and shoulders. One week ago, he began developing a thick, crusting rash on the scrotum and penis. Despite treatment with topical steroids, his rash worsened. Examination in the clinic is notable for a crusted, scaling rash in the groin; a diagnosis of crusted scabies is strongly suspected.