It seems that you may be having delusion
There may be crawling and pin pricking sensation all over body.
You may be having odd sensations any where on body.
Actually, there is no skin disease. But ,you may feel that there is something on the skin and causes sensation of crawling and pricking.
This is obssessive compulsive disorder.
It is psychological skin condition.Pimozide
may be very helpful in this condition.
Fluoxetin and alprazolam may be taken.
However, you consult dermatologist
may be consulted,if needed.
I hope you got my answer.
Dr. Ilyas Patel MD