The reason for the small rice grain bumps on the body is a very common clinical manifestation in dermatology, there are many reasons for the small rice grain bumps on the body, the most common in daily life are mainly the following: 1, allergic dermatitis, if contact with chemicals or dust, pollen, substances that can easily cause allergies, the body will appear red spots, papules, that is, rice grain size bumps. 2, skin follicle keratosis, due to The skin follicles are keratinized due to abnormal skin keratinization, which is the same size as a rice grain keratinized papule. 3. generalized eczema, eczema dermatitis will appear as a generalized rice grain size rash, papule, papule, blister or even ooze. 4. drug dermatitis, a generalized corn grain size pimple due to oral non-carrier anti-inflammatory drugs or antibiotics.