Many small bumps on the body may be caused by eczema, atopic dermatitis, prickly heat, folliculitis and other causes. 1. Eczema: often manifested as many papules and papules on the basis of skin erythema. 2. Allergic dermatitis: After allergens enter the body through skin or mucous membrane contact, injection and ingestion, they can cause many small bumps on the skin. 3. Prickly heat: If the external temperature and other reasons affect the body’s skin heat dissipation, many pinpoint-sized corn rashes will appear. 3. Folliculitis: If the hair follicles are infected by bacteria or fungi, it can cause an inflammatory reaction and the appearance of multiple pimples. It is recommended that people with many small bumps on the body go to the hospital in time to clarify the cause of the disease, and standardized treatment under the guidance of the doctor to avoid delays in the condition.