Small red dots like prickly heat on the body are very itchy may be caused by eczema, hives, insect bite dermatitis and other causes. It can be treated with medicines such as glycerine lotion, mometasone furoate cream and cetirizine tablets under the guidance of a doctor. 1. Eczema: Eczema is a skin reaction caused by a combination of external environmental factors and internal genetic and immune factors. It is usually characterized by itchy red dots like prickly heat, and scratching can lead to erosion or oozing. You can use glycerin lotion and other medications for local application. 2. Hives: may be taking drugs, ingesting proteins, contact with fur, inhaling pollen or contact with chemicals, may be manifested as itchy red dots on the body like prickly heat. Cetirizine tablets, glycerine lotion and other drugs can be used for treatment. 3. Insect bite dermatitis: mites, fleas, lice, bedbugs and other insects bite the skin, its secretion produces an allergic reaction, there will be like prickly heat on the body like small red dots itchy symptoms. Mometasone furoate cream can be used topically after the bite to astringent, anti-itching effect. Itchy red dots like prickly heat are usually a manifestation of skin diseases and should be avoided, and the use of medication should be under the guidance and advice of a doctor.