The common causes of a lot of white bumps like grains of rice on the chest include molluscum contagiosum and milia. 1. Molluscum contagiosum: This disease is caused by the molluscum contagiosum virus infection, which is somewhat infectious. Often manifested as a single or multiple hemispherical papules, skin color or gray, the center of the slightly concave or umbilical concave, the surface of the wax-like luster and other symptoms. The prognosis of the disease is good after active treatment. 2. Corn grain rash: commonly known as prickly heat, mainly due to poor sweat drainage, sweat duct obstruction caused by high temperature and humid environment. The manifestation of dense hair, the size of a needle tip, white crystal clear small blisters. The disease is self-limiting and can be cured naturally. It is recommended that patients with white rice-like bumps on the chest go to the dermatology department of a regular hospital in time, follow the doctor’s instructions to clarify the cause of the disease, reasonable treatment, to avoid delaying the condition.