A red rash on the neck may be caused by eczema, ringworm, prickly heat and other diseases, you can take general treatment, medication and other ways to relieve. 1. Eczema: If eczema causes a red rash on the neck, patients should pay attention to local cleanliness, avoid scratching and rubbing the affected area. You can follow the doctor’s instructions to use topical glucocorticosteroids, such as tretinoin, dexamethasone, etc., with anti-inflammatory and anti-allergic effects. 2. Ringworm: ringworm may also lead to a red rash on the neck, patients should keep the local clean and dry, diligent bathing, change clothes. Can follow the doctor’s instructions for external antifungal drugs, such as ketoconazole, naftifine, etc., to play the role of antibacterial, antiseptic. 3. Prickly heat: it occurs in obese people, especially in the summer, will also cause a red rash on the neck, this time you can follow the doctor’s instructions for external use of glycerin lotion, prickly heat powder and other drugs. In addition, pay attention to the local skin clean and dry, wear loose clothing, keep the surrounding environment at the right temperature. There are many reasons for a rash on the neck, so it is recommended to go to a regular hospital for examination and treatment under the guidance of a doctor.