What's the word for...?

Find that expression on the tip of your tongue

paresthesia

A sensation of tingling, pricking, or creeping on the skin, often felt in the arms, legs, or other parts of the body, usually caused by nerve irritation or damage.

Examples:

After sitting in the same position for too long, I experienced paresthesia in my legs.
The doctor explained that the paresthesia in my fingers could be a sign of carpal tunnel syndrome.

formication

A specific type of paresthesia that resembles the sensation of insects crawling on or under the skin.

Examples:

Patients with delusional parasitosis often report formication, believing they are infested with parasites.
Formication can occur in patients experiencing withdrawal from certain substances.

algophobia

An extreme fear of pain, which may sometimes manifest in hypersensitivity to sensations such as crawling on the skin.

Examples:

Her algophobia was so severe that even a light touch could trigger a panic response.
Understanding algophobia is important in managing chronic pain patients.