A bite like rash that appears suddenly on arms legs or neck or upper chest several itchy bumps ir scratch marks not blisters then goaway within 15-20 minutes without any trace left. The bites seem to be more at evening. I also have an itchy feeling in the head sometimes. What could this be? There is no lice and no bed bugs and not any visible creature. After reading online im starting to get scared of scabies but im a cleanliness freak on my house and myself! Can u help with the diagnosis.