Urticaria, also known as hives, is an outbreak of swollen, pale red bumps or plaques (wheals) on the skin that appear suddenly -- either as a result of the body's reaction to certain allergens, or. Sudden onset and rapid spreading of rash (hives) all over the body may indicate anaphylaxis. Anaphylaxis is a severe allergic reaction, which may be fatal if untreated. A blistering rash may be a sign of pemphigus vulgaris (an autoimmune condition) or a severe drug reaction. In both cases, evaluation by a doctor is a must.
Dec 18, · Eczema (atopic dermatitis) is common among children but can affect adults, too. Severe itchiness (especially at night), fluid-filled bumps, and red to .