Eucerin is known generically as Benzalkonium Chloride Solution and can be used by some patients with penile ulcers, such as those with penile ulcers caused by gram-positive bacteria. Benzalkonium chloride solution is a cationic surfactant, a broad-spectrum bactericide, which can change the permeability of the bacterial plasma membrane, thus hindering its metabolism and killing effect. It has a strong effect on gram-positive bacteria, and is ineffective against Pseudomonas aeruginosa, acid-resistant bacilli and bacterial spores, and is suitable for disinfection of skin, mucous membranes and wounds before surgery. Adverse reactions such as allergic conjunctivitis, decreased visual acuity, contact dermatitis, nausea and cold sweat can occur after using this product. This product is a disinfectant and antiseptic for external use and should not be taken internally. If there is burning sensation, local redness and itching at the site of application, stop using the drug and wash the area. Pregnant women and lactating women should be cautious, allergic to the product, the drug properties have changed when prohibited. Patients who want to use benzalkonium chloride solution to treat penile ulcers are advised to go to a regular hospital, consult a professional doctor, cooperate with the doctor to complete the relevant examination, clarify the cause, and avoid blind use of drugs.