Itchy red spots all over the body may be caused by eczema, papular urticaria, scabies and so on. 1. Eczema: It is a kind of skin inflammatory reaction caused by a variety of internal and external factors. It often manifests itself in the form of skin papules, pimples, redness, swelling, itching and other symptoms, which can manifest as itchy red dots all over the body. 2. Pimple urticaria: It is a kind of allergic skin disease that is easy to recur. Mainly manifested as clusters or scattered red, windswept macules, localized redness and swelling of the rash, blisters in the center, accompanied by itching and other discomforts, which can also be manifested as itchy red dots all over the body. 3. Scabies: It is a kind of infectious skin disease caused by scabies mite parasitizing the skin. Mainly manifested as skin papules, papules, often accompanied by intense itching at night, some patients may appear scabies nodules. It can also be manifested as itchy red dots all over the body. There are many other causes of itchy red dots all over the body, it is recommended to consult a doctor to identify the cause of the disease, and follow the doctor’s advice for further treatment or therapy.