Urticaria is a skin condition caused by contact with something that irritates the skin or causes an allergic reaction. Contact urticaria is different from dermatitis. In particular, it usually occurs quickly following skin contact and disappears again within hours. Common causes of urticaria are:
You could typically see a wheal (swelling) and flare (red mark) reaction.
Someone who has urticaria may suffer itching, tingling or burning sensations at the site of the rash.