Hernia drainage fluid does not usually contaminate the patch. After hernia surgery, a drain is usually left in place to drain out the exudate from the surgical tissue damage in order to reduce local tension and decrease the chance of inflammation. The fluid is not usually allowed to come into contact with the patch and therefore does not usually contaminate the patch. Hernia patch contamination may be the result of poor preoperative skin preparation or injury during skin preparation. Infection can also be caused by irregular placement of the patch. Usually hernia drainage fluid is not a common cause of patch contamination, so patients do not need to worry too much about it, and can perform the procedure properly under the guidance of the doctor. After the operation, you need to use intravenous ceftriaxone sodium, levofloxacin and other antibiotic treatment to prevent infection. Hernia surgery to put the patch is generally not harmful, if there is an infection manifestation, you should promptly ask the doctor to deal with.