A 61-year-old man with rheumatoid arthritis (on high-dose corticosteroids) and a 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 and has been in a nursing home since then during a prolonged period of post-operative immobility. About 3 weeks earlier, he had a pruritic rash on his wrists and fingers. One week ago, he began developing a thick, crusting rash on his chest, back, and abdomen. Examination in the clinic is notable for a crusted, scaling rash; a diagnosis of crusted scabies is strongly suspected.