The appearance of red rash on the stomach of patients may be related to diseases such as prickly heat, eczema, contact dermatitis, etc. Patients can improve their condition through general treatment, medication and physical therapy. 1. Prickly heat: patients should pay attention to keep the skin dry and clean, wear loose clothing, reduce friction in the rash area, and can apply ice to the lesion area to relieve the symptoms. Can be used under the guidance of a doctor to use topical drugs, such as glycerine lotion, hydrocortisone solution, etc.; antibiotic drugs, such as amoxicillin, ampicillin, etc.; antihistamines, such as benadryl, cetirizine, etc. for treatment. 2. Eczema: patients should reduce external stimuli, such as hot water scalding, violent scratching, excessive wiping. Patients can use topical medications under the guidance of doctors, such as glycerine lotion, hydrocortisone cream, etc.; antihistamines, such as loratadine, cetirizine, etc.; glucocorticosteroids, such as prednisone, dexamethasone, etc., can be used for treatment if necessary. 3. Contact dermatitis: patients can follow the doctor’s instructions to use topical drugs, such as mupirocin, glycerine lotion, etc.; antihistamines, such as Benadryl, etc.; antibiotics, such as amoxicillin, etc. for treatment, the emergence of seepage, external zinc oxide oil, 3% boric acid solution, cold wet compress. In addition, rubella, measles, early childhood emergency rash, hand, foot and mouth disease may also cause a red rash on the stomach, it is recommended that the patient timely medical examination, to clarify the cause of the targeted treatment, do not blindly deal with their own.