Urticaria on legs. Numerous small pink urticaria wheals on an 18 year-old male's legs due to exam stress. Urticaria,also known as nettle rash or hives,is a skin condition in which a rash of itchy wheals develops on the skin,usually on the trunk or limbs. The wheals appear in a matter of minutes and usually fade after a few hours. As well as being due to stress,urticaria also occurs as an acute allergic response,triggered,for instance,by particular foods or drugs. It can also result from heat,cold,sunlight or,less frequently,other medical conditions like cancer |