When the flow of blood under that particular part is minimal then you might get such a feeling.
The sensation of your skin crawling is often triggered by fear, anxiety, or stress. It occurs when your nerves send signals to your brain, creating a feeling of discomfort or uneasiness on your skin. This reaction is a physical response to psychological triggers and usually subsides once the trigger is removed.
maybe cause your hair i lifting off the surface of your skin causing it to allow air
horrid stuff
your just paranoid....or you have a parasite. Id get that checked out.
it feels like something is crawling in my back and my head why?
No, dustmites live on dust. If you feel that bugs are crawling all over your skin, then you need to stop taking drugs. Seriously.
Possible you have tapeworms.
then you probably missed the vain then you probably missed the vain
Scabies is a contagious skin disease caused by a species of microscopic mite (sarcoptes scabiei) that burrows under the host's skin, hatching it's young and literally making your skin feel like it's crawling. It's not the bug itself causing the infection and itching, it's their excrement.
I'm not sure what you mean by "crawling skin" but you do itch like crazy. It is caused by the skin streaching and the added blood flow in the body.
hypo= under Dermis= skin something that is hypodermic can go under the skin (e.g. a needle).
Evaporation of fluid from your skin