Explanation:

Botanically called Urtica Dioica, Nettles cause severe itching and burning sensation when it comes into contact with the human skin. Nettles have stinging cells as a protection from plant eating herbivores.

They have thin, hollow, hair which stings and injects formic acid (methanoic acid), histamines, serotonin, choline and other chemicals, causing the itchy, burning effect.

Nettle leaves are rich in vitamins A and C, potassium, manganese etc. and used as food in certain countries.

They are found in most parts of the world and surprisingly, it is used in traditional medicines.