I work in a health care facility where one patient was diagnosed with scabies 3 weeks ago, and two co workers are now diagnosed with the same. How much longer would the incubation time be for the rest of us? Do scabies respond to calamine lotion not only reducing the itching but also fading the marks and eruptions? And finally, do scabies always itch? My hives are only visually noticable they don't itch.