Can someone identify this stinging plant?
I think it is a common stinging nettle, Urtica dioica. It is a native to Europe, Asia, northern Africa, and western North America and is the best-known member of the nettle genus Urtica. As commented by others, your geographical location would be helpful to obtain a more accurate identification. 

Like other stinging nettles, it is unpleasant to the touch, but harmless. Just be patient. The redness and burning/itching will disappear. If the pain gets serious or other complaints arise, go to your GP. 


Stinging nettle. Source: Health Direct.