What Causes Redness and Swelling at the Male Urethral Opening?

Causes of Redness and Swelling at the Male Urethral Opening This may result from external pressure or trauma to the urethral opening, leading to redness and swelling. It may also be caused by infection—commonly bacterial or fungal urethritis. Poor hygiene can allow bacteria to enter through the urethral opening, causing urethritis and subsequent redness and swelling. Additionally, conditions such as phimosis (excessively long foreskin) or other forms of trauma may also lead to redness and swelling at the urethral opening.