A red rash on the waist is particularly itchy can be considered with hives, eczema, insect bite dermatitis and other diseases, generally used glycerine lotion, mometasone furoate cream, loratadine tablets and other drugs. 1. Hives: allergies after contact with chemical fiber material clothing, there will be a waist long a red rash especially itchy waist allergy symptoms. At this time can be applied locally glycerine lotion and other drugs to stop itching, serious cases can be oral cetirizine hydrochloride and other anti-allergy drugs. 2. Eczema: a red rash on the waist especially itchy can be considered eczema, the cause is unknown, may be related to drugs, infection, allergies and other factors. You can find out the cause of the disease first, local application of mometasone furoate cream and other drugs to ease the discomfort. 3. Insect bite dermatitis: a red rash on the waist is particularly itchy and mosquito bites caused by perverse reactions. Can be applied locally mometasone furoate cream and other drugs, if broken should be used externally anti-infective drugs such as fusidic acid cream, severe oral loratadine tablets and other anti-allergy drugs. The discovery of a red rash on the waist especially itchy may also be other reasons, it is recommended to go to the regular hospital for standardized diagnosis and treatment in a timely manner. When using medication, need to be under the guidance of a doctor.