The sudden growth of red bumps on the body may be caused by ringworm, hives and atopic eczema. 1. Ringworm: when the patient is infected by fungus, he may suffer from ringworm, and the phenomenon of sudden growth of red packets on the body may occur, usually accompanied by itching. 2. urticaria: urticaria is due to the expansion of small blood vessels in the skin, mucous membranes and increase in permeability and the emergence of a limited edema reaction, urticaria belongs to a kind of allergy phenomenon, when the patient is in contact with allergens will appear on the body suddenly grew a lot of red bags of symptoms, usually accompanied by itching. 3. Eczema: when the patient in the allergic substances, eating allergic food will appear eczema, the body will suddenly grow a lot of red packets of symptoms. When the patient suddenly grows a lot of red packets on the body, exclude physiological reasons, go to the hospital in time for allergen examination, clear cause and actively cooperate with the doctor’s treatment.