F. Other Sexually Transmitted Infections
Certain sexually transmitted infections can cause genital sores, ulcers, or other skin changes.
Syphilis, for example, can cause a sore that is often painless, although appearances can vary. Other infections may produce ulcers, inflammation, or symptoms that are not immediately obvious.
A person cannot reliably rule out an STI based solely on whether a lesion hurts or itches.
When genital sores develop, especially after a new sexual contact, medical evaluation and appropriate testing are important.
5. Why the Location of a Skin Lesion Matters
The body location of a lesion can help guide the diagnostic process.
Lesions Around the Lips
Small bumps around the lips may be caused by oral herpes, folliculitis in nearby hair-bearing skin, acne, irritation, or other conditions.
The pattern can be informative. Recurrent clusters of blisters preceded by tingling may suggest herpes, while a single ulcer inside the mouth may have a different cause.
However, the pattern is not definitive, and testing may be appropriate when the diagnosis is uncertain.
Lesions in Hair-Bearing Areas
Pus-filled bumps around individual hairs may suggest folliculitis or another inflammatory condition affecting hair follicles.
Shaving, sweating, tight clothing, and friction may contribute to the problem.
If lesions develop deep swelling, severe tenderness, or spreading redness, an abscess or a more significant infection should be considered.
Lesions Around the Genitals
Genital skin is sensitive and can develop irritation, folliculitis, fungal infections, herpes, warts, and other conditions.
Because some sexually transmitted infections produce similar-looking lesions, genital sores should not automatically be attributed to shaving or friction.
A healthcare professional can assess the appearance, take a relevant medical history, and recommend tests based on the findings.
There is no need to feel ashamed about seeking care for genital symptoms. These are common medical concerns, and early assessment can make treatment more effective.
6. Early Warning Signs That Require Medical Attention
Many minor skin problems can be treated successfully, but certain symptoms suggest that professional evaluation should not be delayed.
Seek prompt medical advice if you notice:
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Painful or rapidly spreading blisters or sores.
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Increasing redness, warmth, or swelling around a lesion.
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Large, tender, pus-filled lumps.
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Fever or chills accompanying a skin eruption.
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Red streaks extending away from an infected area.
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Genital sores or blisters that have not been diagnosed.
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Painful urination or difficulty urinating.
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Lesions that repeatedly return or fail to heal.
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Skin changes accompanied by swollen lymph nodes or feeling seriously unwell.
Some situations require emergency care. Rapidly spreading redness accompanied by severe pain, confusion, faintness, or other signs of serious illness should be treated as an emergency.
People with diabetes, weakened immune systems, or certain chronic medical conditions may need earlier assessment because some infections can progress more rapidly or become more severe.
Eye involvement is also important. Blisters or sores near the eye, eye pain, light sensitivity, or changes in vision require urgent medical evaluation because certain infections can threaten vision.
For genital sores that may be herpes, early assessment is particularly useful because a clinician can collect a sample while a fresh lesion is present.
7. How Doctors Determine the Cause
An accurate diagnosis begins with a careful history and examination.
The clinician may ask when the lesions appeared, whether they are painful or itchy, whether they contain fluid or pus, whether they have changed over time, and whether similar symptoms occurred previously.
They may also ask about shaving, recent skin injuries, new products, medication use, sexual exposure, and previous infections.
These questions help distinguish among possible causes without relying on appearance alone.
Swab Testing for Herpes
When an active lesion is suspected to be herpes, a clinician may collect a swab for a polymerase chain reaction test, commonly called PCR.
PCR testing can detect HSV genetic material and is generally preferred for evaluating an active lesion when available.
Testing is often most useful when the lesion is fresh. As a lesion heals, the amount of detectable virus may decrease, and a negative result does not always exclude infection.
Blood tests for HSV antibodies have different limitations and are not interchangeable with testing a lesion directly. Their use should be guided by the clinical situation.
Bacterial Testing
When a bacterial infection is suspected, a clinician may collect pus or another appropriate sample for laboratory testing.
A culture can sometimes identify the organism and help determine which antibiotics are likely to be effective.
Testing may be particularly useful for recurrent, severe, or treatment-resistant infections.
Testing for Other Sexually Transmitted Infections
Depending on the presentation and sexual history, a clinician may recommend tests for syphilis, HIV, or other STIs.
The appropriate tests depend on the symptoms and the timing of possible exposure. Some infections require repeat testing if an initial test is performed too early.
Testing should be selected according to the suspected condition rather than using one test to rule out every possible cause.
8. What You Should Avoid Doing When You Notice These Bumps
The way a person handles a skin lesion can affect healing and the risk of spreading infection.