Is a Bruise on the Penis a Sign of STDs? Urological Concerns - Urology

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If there are bruises on the penis, is this a sign of a sexually transmitted infection?


I am 20 years old and have a steady girlfriend.
Two years ago, she engaged in a risky oral sex act, but there have been no unusual symptoms since then.
About a month ago, I noticed something resembling a pimple at the base of my penis and consulted a doctor who said it was not a sexually transmitted infection (STI), so I didn't worry about it.
Recently, after having sex with my girlfriend, I noticed a bruise-like appearance on my penis when I went to the bathroom.
Before that, we had been engaging in other activities, and she was performing on my thigh while we watched a movie for over an hour.
However, there is no pain or itching, just a small dark purple spot.
Since I am not very knowledgeable about STIs and cannot find relevant information, I would like to ask if this is a sign of an STI.

Xiao Ting, 20~29 year old female. Ask Date: 2005/07/11

Dr. Liu Jianting reply Urology


Bruises? Really? Don't worry! There have been no symptoms of sexually transmitted infections (STIs) associated with bruising.
For peace of mind, it's still advisable to consult a urologist.

Reply Date: 2005/07/11

More Info


A bruise on the penis can be concerning, especially for someone who is sexually active and aware of sexually transmitted diseases (STDs). However, it is important to understand that not all changes in the genital area are indicative of STDs. In your case, the bruise-like appearance on the penis, especially if it is not accompanied by pain, itching, or other symptoms, may not necessarily be a sign of an STD.

Bruising in the genital area can occur for several reasons. One common cause is trauma or friction during sexual activity. If you engaged in activities that involved significant pressure or friction, such as prolonged contact or vigorous movements, this could lead to minor bruising. The penis is a sensitive area, and even minor trauma can result in discoloration without any underlying disease.

It's also worth noting that the appearance of a pimple-like lesion at the base of the penis, which your doctor assessed as non-STD related, could be a normal anatomical variation or a benign condition such as a sebaceous cyst or folliculitis. These conditions are not uncommon and can occur in anyone, regardless of sexual history.

While your doctor has reassured you that the lesion is not an STD, it is always prudent to keep an eye on any changes in your body. If the bruise persists, changes in size, color, or if you develop additional symptoms such as pain, swelling, or discharge, it would be wise to follow up with a healthcare provider. They can perform a thorough examination and possibly run tests if necessary.

In terms of STDs, many of them present with specific symptoms such as unusual discharge, sores, or persistent pain. Common STDs like chlamydia, gonorrhea, and herpes can have distinct signs that are typically more pronounced than a simple bruise. If you have concerns about STDs due to past sexual encounters, consider getting tested. Regular screening is a responsible practice for sexually active individuals, especially if there has been any potential exposure to STDs.

In summary, while a bruise on the penis can be alarming, it is not automatically indicative of an STD, especially in the absence of other symptoms. It is likely related to trauma or friction. However, if you have ongoing concerns or if the condition changes, do not hesitate to seek medical advice for peace of mind and proper evaluation. Regular check-ups and open communication with your healthcare provider about sexual health are essential components of maintaining overall well-being.

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