Balanitis (inflamed glans): causes and when it is an STI

Balanitis is inflammation of the glans penis. Most of the time it is not an STI. In an Australian clinic that only sees men with genital skin complaints, the 331 patients most often turned out to have ordinary skin irritation: contact irritation topped the list with 67 cases, while genital warts appeared 18 times (Bunker, 2017).

That is not the whole story though. The 2026 British guideline on balanoposthitis names exactly one reason why an accurate diagnosis matters: to avoid unnecessary antibiotics, and to identify an STI when there is one (BASHH, 2026).

Both things are true. It is almost never an STI, and you cannot tell by looking.

That tension is what this article is about. Below you will read what balanitis is, which causes are in play, how to tell them apart, and where a test does and does not help. We are a testing provider, so let us say it up front: for most causes on this page, our test finds nothing. That is not a sales angle, that is biology.

What exactly is balanitis?

Balanitis is inflammation of the glans penis. When the foreskin joins in, it is called balanoposthitis. You notice it as redness, itching, a burning feeling, sometimes swelling or discharge under the foreskin. It describes what is visible. It is not a diagnosis by itself.

That distinction matters more than it sounds.

"Balanitis" says nothing about the cause. It works like "fever": it tells you something is going on, not what. The BASHH guideline accordingly describes balanoposthitis as an umbrella term for a broad spectrum of infective, inflammatory, premalignant and systemic conditions of the glans and foreskin (BASHH, 2026).

So anyone reading "balanitis is treated with an antifungal cream" is reading a half truth. That holds for one cause. For most of the others it does not.

Is an inflamed glans an STI?

Usually not. Most cases of balanitis come from candida, from bacteria building up under the foreskin, or from irritation by soap, detergent or overzealous washing. None of those is sexually transmitted. Still, an STI does sit on the list of possible causes, and that list is not something you can rule out from a distance.

The Dutch GP treatment guideline on infectious balanitis names STIs alongside candida and bacteria, plus non-infectious things such as trauma or an allergic reaction. So it is not either-or.

Here is what often goes wrong. People see redness, jump to the worst case, and book a test. Or they see redness, blame new soap, and never look again. Both can be off the mark.

The practical difference sits in the urethra. Complaints coming mainly from the urethra, such as discharge or pain when peeing, fit a more STI-like urethritis. Complaints sitting on the skin of the glans fit candida or irritation better. That is a rule of thumb, not a law. Our article on a burning feeling when urinating goes deeper into that split.

What can cause an inflamed glans?

The causes fall roughly into four groups: fungal (usually candida), bacterial, irritation or allergy, and skin conditions such as lichen sclerosus or eczema. An STI can sit underneath it too, but usually does not live in the skin of the glans itself. The table below sets them side by side, including what an STI test can and cannot do with each.

This table is the honest part of the article. Look at that last column.

Six of the seven rows give our test nothing to find. That is exactly why we build this table: if you had seen it beforehand, you might not have booked a test. We think that is a better outcome than a test bought to reassure you about something it never looks at.

How do you know whether it is candida?

Candida classically causes itching, redness and a white, crumbly coating under the foreskin. It is more common in men with diabetes, because high blood sugar weakens local defences and yeasts take advantage (Talapko, 2024). Even so, "white coating means candida" is one of the biggest thinking errors around this topic.

Why? Because there is a condition that looks exactly like it and is something else entirely.

A 2026 systematic review looked at men whose lichen sclerosus had been reported as candidal balanitis or another infective balanitis. The conclusion: lichen sclerosus is regularly misattributed, including by clinicians who do not look at it daily, partly because inflamed skin picks up yeasts secondarily anyway (Kravvas, 2026). So it is not strange that you cannot tell. Specialists get it wrong too.

That is why we are not putting a self-diagnosis checklist here. If pharmacy cream does nothing after a week, "more cream" is rarely the answer.

When is an STI test useful?

An STI test looks at chlamydia, gonorrhoea, trichomonas, HIV, syphilis and hepatitis. Of that list, mainly the first three cause complaints that can resemble balanitis, and then mostly through the urethra. If your complaint sits in the skin of the glans, the test looks straight past it.

So the practical question is not "do I have balanitis". It is "was there unprotected contact I still know nothing about".

Some people get checked because they want that second uncertainty gone, separate from the red glans. That is a fine reason. Our test for chlamydia, gonorrhoea and trichomonas shows those three with a PCR. What it does not do is tell you where that red patch came from.

If your main question is which test fits which complaint, our overview of which STI test you need when helps. And if your complaint is more of a bump or blister than redness, read what a bump or blister can be.

Two men with exactly the same red glans

Picture two men of 32 seeing exactly the same thing on the same Tuesday morning: a red, irritated glans with some white coating underneath. Same spot, same colour, same itch. For both of them, an STI test is the first thought.

For the first, it started three days ago, after a weekend away with a different shower gel than the one at home. Nothing else: no discharge, no pain when peeing, no unprotected contact in months. For him the chance of an STI is close to zero, and a test would confirm that neatly without saying anything at all about that red glans. Dropping the soap costs him nothing and is probably the whole story.

For the second, it also started three days ago, but there is discharge from the urethra, and there was unprotected contact ten days earlier. Same picture, completely different question. For him it is not about the skin of the glans, but about what is going on in the urethra, and that is exactly where chlamydia, gonorrhoea and trichomonas sit.

So the difference was never in what they saw.

It sat in what happened around it: the soap, the discharge, the contact. That is why we do not use photos or symptom checklists to help you choose. Two identical glans penises can need two completely different answers, and only you know what else was going on.

Why does balanitis keep coming back?

Recurring complaints rarely point to an STI that will not clear. More often there is an underlying reason why it stays warm and damp under the foreskin, or the cause was never properly established. An uncircumcised foreskin plays a role, and sometimes a skin condition is being treated as an infection.

The numbers from that Australian clinic are interesting here. Across the ten most common diagnoses, more than 70 percent of patients were uncircumcised, and atopy came up strikingly often (Bunker, 2017). Moisture, friction and sensitive skin form a recurring pattern together.

A Canadian review from 2025 explains why foreskin care has grown more important in recent years: with fewer newborns being circumcised, men run into complaints that simply came up less often before, and education about it is scarce (Cheng, 2025).

If it keeps returning, more of the same is rarely the fix. The question is whether the cause is right. That conversation belongs with your GP, not with us.

What if it does not improve after a few days?

Thuisarts.nl, the patient platform of the Dutch College of General Practitioners, keeps it simple: rinse the glans a few times a day with water, without soap. If complaints do not lessen after a few days, ask your GP for advice. That is not a brush-off, that is the order that prevents the most unnecessary creams.

Soap is the quiet culprit here. It is the single most common diagnosis in that whole Australian series, and it is also the easiest one to remove.

See your GP sooner if there is pain, fever, sores, or if the foreskin will not go back. Those are not things to sit out.

For the record: we are not your GP and this article is not treatment advice. What we do is offer a test for part of the questions on this page, and be honest about the part where it means nothing.

Further reading in this cluster

We work out the individual causes in separate articles. Go to red glans if redness is your main complaint, to yeast on the glans for candida, or to eczema on the glans if your skin is dry and itchy elsewhere too.

If the foreskin is involved, foreskin inflammation is the piece you want. And to read what treatment options exist and who decides on them, go to balanitis treatment.

If your complaint fits the general list better, STI symptoms in men gives the wider overview.

References

• BASHH national guideline on the management of balanoposthitis (and related penile skin conditions), International Journal of STD & AIDS, 2026. PMID 42216889.
• Kravvas G, et al. Male genital lichen sclerosus misreported as candidal or other infective balanitides: a systematic review of the literature. International Journal of STD & AIDS, 2026. PMID 41026603.
• Bunker CB, et al. Skin disease of penis and male genitalia is linked to atopy and circumcision: caseload in a male genital dermatology clinic. Australasian Journal of Dermatology, 2017. PMID 27170096.
• Talapko J, et al. Candida albicans skin infection in diabetic patients: an updated review of pathogenesis and management. Mycoses, 2024. PMID 38877612.
• Cheng H, et al. Foreskin care: hygiene, importance of counselling, and management of common complications. Canadian Family Physician, 2025. PMID 39965976.
• NHG treatment guideline on infectious balanitis from age 12, Dutch College of General Practitioners, December 2018.
• Thuisarts.nl, Ontstoken eikel. Accessed July 2026.

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