Why and how do body parts itch? Why does it feel good to scratch an itch?

Referred itch - Wikipedia

Does scratching an itch provide the body with any biological benefits? - Quora

Do humans have an equivalent reflex to cats and dogs where if you scratch an itch for them the nearest leg starts to 'scratch' in sympathy? - Quora

Top Tips for Relieving Itchy Skin

If you itch, when should you start to worry about it? - The Washington Post

Brachioradial Pruritus – Neuropathic itch – Caring Medical Florida

What exactly is an itch, and why do we get itchy? — Today You Should Know

Why is smacking an itch any better than scratching it? - Quora

Why does my carpet make me itch? - Quora

How long does an itch last if you don't scratch it? - Quora

Why is it healthy to scratch your butt? - Quora

Itchy Skin (Pruritus): Causes, Symptoms, and Treatment