A lot of small red dots on the belly may be caused by eczema, allergies, hives, psoriasis and so on. 1. Eczema: Inflammation of the superficial dermis and epidermis caused by a variety of internal and external factors, such as abnormal immune function, skin barrier dysfunction, etc., resulting in a lot of small red dots on the belly, accompanied by itching. 2. Allergy: When exposed to allergens through skin contact, ingestion, inhalation, etc., it will lead to reactive changes in the body, resulting in a lot of small red spots on the belly. 3. Urticaria: If stimulated by drugs, food and other factors, resulting in the temporary expansion of small blood vessels in the skin mucosa and increased permeability, appearing on the belly a lot of small red dots, and at the same time will cause localized edema, accompanied by obvious itching. 4. Psoriasis: a chronic inflammatory skin disease, with genetic, environmental, autoimmune and other factors, can be manifested as small red spots on the belly, erythema scales. A lot of small red dots on the belly may have other reasons, it is recommended to go to the hospital in a timely manner, a specific examination, according to the results of the examination under the guidance of the doctor targeted treatment, pay attention to skin protection in life, to avoid injury, to maintain clean and sanitary skin.