What is the reason for a stinging sensation when urinating after washing the genital area with shower gel?

Patient's question:

Detailed medical condition and consultation purpose: Two nights ago, I took a bath. Because there was a lot of dirt inside the foreskin, I used the newly bought Amway soap to clean it. As a result, immediately after washing, the foreskin and the urethral meatus became swollen. I felt a stinging sensation when urinating!
Current general condition: It's already the third day today. The stinging sensation when urinating has disappeared. However, the line connecting the urethral meatus and the area below it is still swollen. I don't know what to call that line. Although there's no pain, I still feel uneasy. I'm wondering if I need to go to the hospital for this? Am I sick? What is that line called? And why is it swollen?

Doctor's answer:

Hello! According to the situation you described, it is considered to be caused by the irritation of the shower gel. Shower gel is an alkaline liquid, and frequently using shower gel to clean the external genital area can cause irritation to the skin of the external genital area, urethra, and vagina.

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