What is the reason for the redness and swelling of a baby's penis?

Patient's question:

Detailed medical condition and consultation purpose: Redness and pain~ What's going on, how to treat it

Doctor's answer:

From the symptoms, it should be balanitis. Quickly use a very dilute potassium permanganate solution (also known as PP powder, which has a faint pink color and can turn the skin black if too concentrated) to soak the penis and urethral opening. At 5 weeks old, the child can take some antibiotics orally, such as amoxicillin or other pediatric formulations. If you can't find PP powder, you can also use strong green tea water as a substitute. Once the swelling subsides, clean the little penis daily by lifting it up during bathing. Otherwise, it may still become inflamed again.