The cause of many red bumps on the body is very itchy is mostly considered allergic dermatitis, urticaria and other diseases, it is recommended that patients clarify the cause of the disease and then deal with it according to the cause of the disease. 1. Allergic dermatitis: after contact with allergens, skin rashes appear, accompanied by itching, redness, swelling, pain and other symptoms. Generally, it can be gradually relieved after detaching from the allergens, and antihistamine drugs such as loratadine should be given if necessary. 2. Urticaria: due to allergies, infections and other factors lead to urticaria, the patient’s skin surface in addition to itching, but also with red or white masses. It is generally recommended to be treated with antihistamines such as cetirizine. Patients with a lot of itchy red bumps on the body are advised to consult a doctor in a timely manner to clarify the cause of the disease and choose the appropriate treatment program under the guidance of the doctor.