For the redness of the foreskin caused by bacterial infection, you can take the appropriate amount of erythromycin ointment and apply it to the affected area twice a day, the specific dosage, need to be based on the actual situation. The redness of the foreskin may be caused by inflammation due to bacterial infection, and erythromycin ointment belongs to the class of macrolide antibiotics, which has antibacterial activity against most Gram-positive bacteria, some Gram-negative bacteria, as well as chlamydia, mycoplasma, and other atypical pathogenic bacteria. This product is mainly used for the treatment of mild burns, ulcer surface infections, common acne, etc., the foreskin with inflammation can also use this product. This product is a topical drug, use a small amount of this product can be applied to the affected area, twice a day, this product in the use of occasional irritation symptoms and allergic reactions. People who are allergic to this product should be prohibited from using this product. In addition, after the use of the drug, if there is local itching, redness and swelling, the drug should be stopped immediately and the drug should be cleaned. There are many other causes of redness of the foreskin, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.