Itchy bumps on the stomach may be caused by mosquito bites, contact dermatitis and folliculitis. 1. Mosquito bites: when patients are mosquitoes, insects and other bites to the stomach local skin, toxins into the body may appear inflammatory reaction, appear single or multiple red bumps, and there are symptoms of itching. 2. Contact dermatitis: after contact with substances to which the patient is allergic or irritated, red bumps and itchy symptoms may appear locally on the stomach. 3. Folliculitis: when bacteria and other infections to the stomach localized hair follicles, may cause the stomach localized folliculitis, resulting in red bumps on the stomach and itchy and other adverse symptoms. When the patient stomach on the growth of bumps and itching and other adverse symptoms, it is recommended to go to the hospital in time for examination and diagnosis, and under the guidance of the doctor for treatment.