Sudden itchy bumps on the body may be due to eczema, hives or contact dermatitis, etc. It is recommended to consult a doctor in time. 1. eczema: eczema due to local skin barrier breakage will appear inflammatory reaction, resulting in local skin itching, red bumps, sometimes the surface of the bumps will appear oozing. 2. Hives: Hives due to rapid expansion of the mucous membranes of the skin, resulting in itching of the skin, and there are more red or pale white masses, most of which can subside naturally. 3. Contact dermatitis: When the skin comes into contact with irritating substances, contact dermatitis is sometimes caused, resulting in itching, and the contact area will also be a mass of bumps. When the body suddenly itchy and a mass of bumps, it is recommended that timely medical treatment, do not apply their own medication to stop itching, so as not to aggravate the condition.