there's really no way to tell what's going on without seeing your healthcare provider. however the intense itching especially at night and the red pimple-like rash sounds a lot like scabies an infection caused by a mite. typically the rash continues as the intense itching becomes unbearable. remember it's impossible to tell without being evaluated. scabies is a common skin infection and the most common symptom is intense itching mostly at night or after taking a bath. if this sounds like what you are experiencing the infection needs to be treated by a doctor. it very contagious and other members of your family or close contacts can easily get infected. it's important to seek treatment if it is scabies it won't go away on its own.
just over a week ago i stayed over at a friends house and it was very filthy. i noticed red spots all over my body later. the spots have cleared up but now i'm feeling itchy at night commonly in bed. i'm not sure if i'm just being paranoid or if something is wrong. i'm not getting any new red spots.