Thanks for your query,
Feeling worm crawling under skin can be due to irritation of never, drugs, stress/anxiety
or Delusions of parasitosis.
It is often known as formication
and reassuring patients that no parasitosis exists can be difficult because they typically refuse to believe that their disease is functional rather than organic. Although results of objective laboratory tests may satisfy the doctor, psychiatric therapy must be approached in patients with delusional parasitosis
Hope it helps.