There is pus on the stomach and it is hard inside consider with subcutaneous tissue infection, sebaceous cysts, malignant tumors, can be treated by medication, surgical treatment of the way. 1. Subcutaneous tissue infection: mostly carbuncle, mostly seen in diabetes and other patients with poor resistance. Need intravenous piperacillin tazobactam sodium, ceftriaxone sodium and other antibiotic treatment, and external ichthyol ointment to promote abscess formation. After the formation of abscesses need to be incised and drained, clean up the necrotic tissues, and change the medicine regularly. 2. Sebaceous cysts: if the sebaceous cysts secondary infection caused by the abscess, need to timely cut the abscess, the pus in the hard lumps to remove clean, regular disinfection, dressing change, drainage of pus treatment, and take amoxicillin, cefaclor and other antibiotic treatment. 3. Malignant tumors: If malignant tumors in the abdomen to form a larger volume of pus cavity, should consider timely surgical resection of malignant tumors and necrotic tissue of the abdominal wall, healing and further anti-tumor therapy. If there is a pus on the stomach and the inside is very hard, it is recommended to go to the hospital for treatment in a timely manner, do not blindly use their own medication to avoid serious conditions, resulting in other damages.