What is the reason for small bumps caused by post-coital itching?

Patient's question:

Currently, in general situations: About a day after having sex with my girlfriend, my glans became itchy, and small, grain-like bumps appeared. Additionally, my girlfriend also said her lower abdomen was itchy. I wonder if it's an allergy to the condom? ??? Since my girlfriend is with me every day and this has never happened before, only after changing the condom did this occur. I don't know what to do. ???
Can you doctors please help me figure this out?
Thank you

Doctor's answer:

Hello friend, your condition is likely caused by balanitis, which is often triggered by underwear friction, trauma, or local irritation from soaps and cleaning agents. It manifests as swelling, redness, exudation, and erosion. Secondary infection may lead to purulent discharge, easily forming ulcers, accompanied by pain. You can use a 3% boric acid solution or a 0.05% emodin solution for wet compresses. I believe most people know that balanitis can cause significant harm to patients, so it's important to seek treatment as soon as possible. In daily life, pay attention to dietary issues—stick to a light diet and avoid foods. Additionally, regular follow-up visits may be necessary when needed.

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