The appearance of red acne on the patient’s stomach is mostly considered to be due to various internal and external causes of skin-like diseases, commonly such as folliculitis, sebaceous cysts, contact dermatitis, eczema, and even urticaria, all of which can have the same or similar symptoms. The causes and corresponding treatment of such diseases are as follows: 1. Folliculitis: If a patient’s stomach acne manifests itself as red papules with red, swollen, hot, painful inflammatory reactions, and in severe cases even with pus, rupture and necrosis, it can be considered as folliculitis. It is mostly due to infection of hair follicles caused by pathogens such as bacteria and fungi. Some mild cases of folliculitis do not require treatment and can subside on their own. For more serious and recurrent cases, patients can use antibiotics such as fusidic acid cream, ketoconazole cream or lotion for external application under the guidance of a doctor, or take oral cefuroxime, amoxicillin, doxycycline, itraconazole and other drugs for relief; 2. Sebaceous cysts: If acne is specifically manifested as a volume of varying sizes, mostly round, medium When it is hard or elastic, higher than the skin surface and has a smooth surface, it is considered to be a sebaceous cyst. The occurrence of this disease is usually associated with improper cleaning, sweat contamination, or epidermal breakage that leads to infection, resulting in obstruction of the sebaceous ducts. For smaller cysts that do not affect normal life, no treatment can be given. For cysts that have a tendency to increase and affect the patient’s life, surgical treatment can be given by making an incision at the site of occurrence and removing the cyst, or laser treatment can be chosen; 3. Contact dermatitis: If the patient’s stomach has been in contact with allergens, such as seawater, skin care products, clothing friction, etc., contact dermatitis may arise. In addition to red pimples, it can also be accompanied by itching, pain, burning sensation, oozing pus and other symptoms. Glucocorticoids such as prednisone and hydrocortisone; anti-infective drugs such as mupirocin and penicillin, and antihistamines such as loratadine can be used for comprehensive treatment as prescribed by the doctor. At the same time, attention should be paid to the protection of the skin on the stomach, do not scratch, do not stimulate, proper rest is conducive to the remission of symptoms; 4, eczema: eczema on the stomach can have papules, rashes and other manifestations, mostly with external environmental stimuli such as sun exposure, exposure to animal hair or pollen, may also be related to abnormalities in autoimmune function, the presence of chronic diseases. Patients are advised to apply topical Furamax lotion, glucocorticoid cream or gel such as dexamethasone cream, halometasone cream and other drugs for local application, while reducing the stimulation of external factors, such as hot water scalding, violent scratching, excessive rubbing, etc., to avoid repeated development of symptoms; 5, urticaria: Mostly due to food, drug stimulation, or respiratory inhalation of pollen, irritant gas, can make the skin on the stomach appear size varying clump-like elevation, bright red or pale white, with obvious itching. It is recommended that second-generation antihistamines without sedation or with low sedative effect, such as fexofenadine, loratadine, cetirizine, and olopatadine, are preferred for treatment. Care should also be taken to keep away from irritants and remove triggers. In addition, diseases such as scabies and shingles can also cause the symptoms of red pimples on the stomach, and it is recommended to go to the hospital in time to identify the cause and then carry out symptomatic treatment.