亀頭包皮炎：一般的な陰茎皮膚感染症

最終更新日： 2026年8月30日

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Inflammation of the penile skin — 亀頭包皮炎 — is one of the commonest reasons men come to see a urologist, and one of the most distressing to live with. It is uncomfortable, it is embarrassing to talk about, and because of where it is, most men worry far more than the condition warrants. The good news is that it is straightforward to treat once the cause is identified.

• 泌尿器センター バンコク病院 タイ オンライン予約 02-310-3009 bhquro@bdms.co.th
• サミティジ・シラチャ病院 チョンブリ 088-022-1445

What the word means

Balanoposthitis combines two terms: 亀頭炎, inflammation of the glans, and 後炎, inflammation of the foreskin. Together they describe inflammation affecting both.

Who it affects, and why

It occurs at every age, and around 12–20% of cases are precipitated by poor hygiene. The typical picture differs by age group: in children it is usually physiological phimosis combined with hygiene difficulties, while in adults the common combination is an uncircumcised foreskin together with diabetes.

The mechanism is the same in each case. Moisture — sweat, urine and smegma — becomes trapped between the layers of penile skin, and that warm, damp, enclosed space is an ideal environment for bacteria and yeast to multiply.

Symptoms and treatment

Patients typically present with pain, itching, rash and redness, and in more severe cases a foul-smelling discharge. Treatment depends on what is growing: bacterial cases are managed with antiseptic ointment and, where infection is confirmed, oral antibiotics, while fungal (Candida) cases need an antifungal cream instead. In every case, changing the hygiene routine is what prevents it returning — gently retracting the foreskin and cleaning with warm water daily.

Two practical points about that hygiene advice, because both are commonly got wrong and both cause harm.

• Warm water means warm water. Soap, antiseptic washes and scrubbing are a frequent reason inflammation persists rather than settles — the skin under the foreskin is delicate, and stripping it of its natural oils keeps it irritated. If you have been washing harder and more often because it is not getting better, that may be part of why.
• Always return the foreskin to its normal position afterwards, and never force it back if it is tight. A retracted foreskin left back on an already swollen penis can trap and constrict the glans — a condition called paraphimosis — and that is an emergency. Retract gently, only as far as it moves easily, clean, dry, and push it forward again.

Where episodes keep recurring, circumcision is an option worth discussing — it has been shown to reduce recurrence by around 68%. It is not needed for a first episode, and it is a decision to weigh up rather than a default.

One point deserves emphasis for adult men: recurrent balanoposthitis can be the first sign of undiagnosed or poorly controlled diabetes. If it keeps coming back, a blood sugar check belongs in the workup.

When it is not simply an infection

Most cases are exactly what this article describes and clear up with the right cream and a change of routine. But not every red, sore glans is an infection, and it matters because the wrong assumption leads to months of repeating a treatment that was never going to work.

Skin conditions can look identical to infection here — irritant reactions to soaps or latex, eczema, psoriasis, and the scarring condition sometimes called lichen sclerosus, which produces a pale, firm, tight ring at the tip of the foreskin and does not respond to antibiotics or antifungals. Some sexually transmitted infections also present this way, so an STI screen is worth considering depending on the history. And rarely, a persistent red patch on the glans that keeps being treated as infection and never quite clears can be an early skin cancer, which is diagnosed with a small biopsy rather than another course of cream.

The practical rule is simple: if it has not cleared after a proper course of treatment, the answer is a review and possibly a swab or a biopsy — not another cream. Repeating treatment for a diagnosis that was never confirmed is the commonest way these cases get delayed.

当日受診すべき場合

This condition is usually a nuisance rather than a danger. These are the exceptions. Go to an emergency department the same day — in Thailand you can call 1669:

• Pain far out of proportion to how the skin looks, redness or swelling that is spreading over hours rather than days, any purple, grey or black discolouration of the skin, a crackling feeling under the skin, or fever with feeling very unwell. Deep, rapidly spreading infection of the genital and perineal skin is uncommon, but it is life-threatening, it moves fast, and men with diabetes are the group most at risk — which is the same group this article has been describing throughout. It is far better to be sent home reassured than to wait on this one.
• A foreskin that has been pulled back and will not go forward again, with the head of the penis swelling or darkening.
• Inability to pass urine, or fever with pain in the back or lower abdomen.

お客様からよくいただくご質問

Q1: 亀頭包皮炎とは何ですか、またその原因は何ですか？

亀頭包皮炎（きとうほうひえん）は、陰茎（ペニス）の亀頭（先頭部）と包皮（包皮）の両方の炎症です。これは、汗や尿、恥垢などの湿気や分泌物が包皮の下に閉じ込められ、細菌や真菌の増殖に適した環境を作り出すことが原因で起こります。一般的なリスクファクターには、不十分な陰茎の衛生状態、割礼を受けていないこと、包茎（包皮が狭いこと）、そして免疫防御を損ない酵母菌の過剰増殖を促進する糖尿病などが含まれます。.

Q2: 亀頭包皮炎の症状は何ですか？

一般的な症状としては、亀頭と包皮の赤み、腫れ、かゆみ、痛みなどがあります。重症例では、悪臭のある分泌物、皮膚の発疹、潰瘍が見られることがあります。また、包皮を剥くのが困難になったり痛みを伴ったりすることもあります。早期発見と治療により、病状の悪化や再発を防ぐことができます。.

Q3: 亀頭包皮炎はどのように治療されますか？

Treatment depends on the underlying cause. Bacterial balanoposthitis is treated with antiseptic ointment and oral antibiotics. Fungal cases are treated with antifungal creams. In all cases, improved penile hygiene is essential. The foreskin should be gently retracted and the area cleaned with warm water daily — warm water rather than soap or antiseptic washes, which frequently keep the skin irritated — and always returned to its normal position afterwards. If balanoposthitis recurs frequently, circumcision may be recommended as it has been shown to reduce the recurrence rate by approximately 68%.

Q4: I have been treating it and it is not clearing. What now?

Go back rather than repeating the treatment. Not every red, sore glans is an infection: irritant reactions to soaps or latex, eczema, psoriasis, and the scarring condition lichen sclerosus can all look the same and none of them respond to antibiotics or antifungals. Some sexually transmitted infections present this way too. Rarely, a persistent patch that never quite clears can be an early skin cancer, diagnosed with a small biopsy. Over-washing with soap is itself a common reason inflammation persists. If a proper course of treatment has not worked, the next step is a review, and possibly a swab or biopsy, rather than another cream.

Q5: Can diabetes cause balanoposthitis?

Yes. Diabetes mellitus is one of the most significant risk factors for balanoposthitis in adult men. High blood sugar levels impair immune function and promote yeast (Candida) overgrowth in warm moist areas such as under the foreskin. Men with poorly controlled diabetes are particularly susceptible to recurrent balanoposthitis. Controlling blood sugar is an important part of long-term prevention, and men with diabetes should also take the emergency signs below seriously, since they are the group most at risk of the rare deep infection described there.

Q6: When does this need emergency care?

Go to an emergency department the same day, or call 1669 in Thailand, for pain that is far out of proportion to how the skin looks, redness or swelling spreading over hours rather than days, purple, grey or black discolouration, a crackling feeling under the skin, or fever with feeling very unwell. Deep, rapidly spreading infection of the genital and perineal skin is uncommon but life-threatening and moves quickly, and men with diabetes are most at risk. Also go the same day if the foreskin has been pulled back and will not go forward again with the glans swelling or darkening, or if you cannot pass urine.

Q7: Does balanoposthitis require circumcision?

包茎手術は、通常、薬物療法と衛生状態の改善で管理される亀頭包皮炎の初回エピソードには必要ありません。しかし、再発性の亀頭包皮炎を経験する男性にとって、包茎手術は再発を約68%減少させる、証明された効果的な予防策です。包茎手術が適切かどうかは、エピソードの頻度と重症度に基づいて、泌尿器科医がアドバイスします。.

Q8: Does my partner need treating too?

Sometimes. Balanoposthitis is not usually a sexually transmitted condition, and in most cases a partner needs nothing. But where thrush is the cause it can pass back and forth between partners, so if your partner has symptoms they should be treated at the same time — otherwise the problem returns as soon as yours settles. Where the history raises the possibility of a sexually transmitted infection, testing is worth doing rather than assuming, and that is a conversation to have openly at the appointment.

Q9: Can this be discussed by video consultation?

Partly, and it is a reasonable first step for a condition many men delay seeking help for out of embarrassment. Bangkok Hospital Headquarters offers a Telemedicine service, arranged in advance by email to the Urology department at bhquro@bdms.co.th, and it suits reviewing a known diagnosis, discussing recurrence and deciding whether circumcision is worth considering. A first episode, and anything that has failed to clear with treatment, needs an in-person look, because distinguishing infection from a skin condition is done by examining it. Samitivej Sriracha is in-person only, booked through the Urology department line 088-022-1445.

If you are experiencing symptoms of penile skin infection or recurrent balanoposthitis, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. Children are seen from the age of 3 upward; infants and children under 3 are referred to a paediatric urologist. 診療をご予約. サミティウェート・シーラチャ病院のご予約は、泌尿器科（電話番号：）までお問い合わせください。 088-022-1445. 診察や治療の費用に関するご質問は病院に直接お問い合わせください。バンコク病院の場合は、Eメール（宛先： bhquro@bdms.co.th.

Reference

• Balanoposthitis. StatPearls, National Center for Biotechnology Information. NCBI Bookshelf NBK537143

免責事項 This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice, and it cannot substitute for examining the skin in question. No medical advice, diagnosis or prescription is provided through personal messaging channels or social media. Always consult a qualified healthcare professional before starting any medical treatment. In an emergency, attend the nearest emergency department — in Thailand the emergency number is 1669.