An otherwise healthy 36-year old man presents to your office with a 4-week history of a generalized, intensely pruritic papular rash. On examination, he has excoriated papules and vesicles on wrists, sides of fingers, arms, and buttocks. No other abnormalities are noted. His 9-year-old son also has had itching on fingers and wrists. Which one of the following is the most likely diagnosis? 1.Neurodermatitis 2.Impetigo 3.Pityriasis rosea 4.Shingles 5.Scabies