It is not medically clear which red dots on the body are cancer. However, the appearance of red spots on the body can be considered skin allergies, spider nevi, hemangiomas and other diseases. 1. Skin allergy: When the body is exposed to allergens such as dust, mites, pollen, etc., it will stimulate the body’s immune system, making the appearance of skin red spots, itching and other allergic phenomena. In order to relieve the red spots on the body, anti-allergy drugs such as loratadine can be taken under the guidance of a doctor. 2. Spider nevus: when liver damage causes a decrease in the metabolic capacity of liver function, it will lead to a decrease in the inactivation of estrogen in the body, which will lead to the entry of estrogen into the blood circulation, so that small arterial terminal branches expand, swell, and form a small red dot. 3. Hemangioma: abnormal proliferation of vascular endothelial cells will lead to different degrees of red dots on vascular skin and subcutaneous tissues, but generally do not cause pain. If obvious red dots appear in the body, we should pay attention to it, go to the hospital in time, and follow the doctor’s instruction to deal with it or standardize the treatment after clear diagnosis.