Small red bumps on the body may be considered to be caused by folliculitis, skin allergies, hives and other diseases. 1. Folliculitis: when hair follicles are infected by microorganisms such as bacteria or fungi, it will lead to the appearance of scattered distribution of small red bumps of the size of a needle tip on the chest, back and other parts of the body, and pain when pressed. 2. Skin allergy: when the human body is exposed to allergens (such as pollen, fur, etc.), resulting in skin redness, pimples and bumps. At this time, it is recommended to go to the hospital to clarify the allergens and carry out anti-allergy treatment. At the same time, you should avoid contact with allergens. 3. Urticaria: Urticaria will lead to the appearance of a patch of red patches and masses on the body, causing the skin to suddenly appear red, swollen and itchy, and gradually expanding into patches from an isolated or scattered state. Usually the rash can subside spontaneously within 24 hours, but new rashes can appear one after another, one after another. When small red bumps develop on the body, you should avoid scratching the itchy area and pay attention to local hygiene. If the symptoms are severe and the bumps do not subside, it is recommended to go to the hospital to determine the cause of the problem and get targeted treatment.