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Syphilis (caused by Treponema pallidum) is a sexually transmitted infection that progresses through four distinct clinical stages: primary, secondary, latent, and tertiary, each with characteristic manifestations and varying systemic severity. Recently, syphilis has dramatically resurged in Japan with the highest case count since World War II. The early stages can be successfully treated with penicillin in most cases, but undetected progression can lead to neurosyphilis, cardiovascular syphilis, and gumma formation – severe complications that may be irreversible. In this article, the physicians of Mens Care Clinic provide an overview of each syphilis stage, transmission, RPR/TP serology diagnosis, penicillin treatment, and the importance of treating partners.

Table of Contents
“There is a painless ulcer in my genital area,” “I noticed a rash on my palms and soles,” “Lab tests revealed an unexpected positive RPR” – these can all be early signs of syphilis, an STI that has resurged dramatically in Japan in recent years. Cases peaked at over 12,000 in 2022 – the highest since 1948.
The bottom line: syphilis is curable with penicillin in early stages but causes irreversible damage if allowed to progress to tertiary or neurosyphilis. The four-stage progression makes this disease especially insidious – the primary chancre is painless and resolves without treatment, leading many patients to ignore the early warning sign.
Below, the physicians at Mens Care Clinic provide a comprehensive guide to recognizing each stage, getting tested, and obtaining timely treatment.


Syphilis is a sexually transmitted bacterial infection caused by Treponema pallidum, a corkscrew-shaped spirochete. T. pallidum cannot be cultured in standard laboratory conditions and is highly fragile outside the body. The bacterium spreads through direct contact with active lesions, usually during sexual intercourse, oral sex, or kissing of infected lesions.


Primary syphilis appears 10-90 days (mean 21 days) after infection as a single painless ulcer (chancre) at the inoculation site. The chancre is round, indurated, with a clean base, typically 0.5-2 cm in diameter, with painless regional lymphadenopathy.
The painless, self-healing nature of the chancre is the major reason patients fail to seek care, allowing progression to secondary syphilis.


Secondary syphilis appears 4-10 weeks after the primary chancre (or 6 weeks-6 months post-infection) as widespread bacterial dissemination causes diverse manifestations:
The palm/sole rash is highly distinctive but can be missed if not specifically examined. Like the primary chancre, secondary syphilis resolves spontaneously without treatment, leading to the latent stage.


Latent syphilis is asymptomatic infection where the patient remains seropositive but shows no clinical signs. Subdivided into:
About 60-70% of untreated latent syphilis remains asymptomatic for life; 30-40% progresses to tertiary syphilis over 10-30 years.


Tertiary syphilis develops 10-30 years post-infection in 30-40% of untreated patients and includes:
These complications are often irreversible even with treatment, making early diagnosis essential.


Syphilis diagnosis uses two complementary blood tests:
Combined positive results confirm syphilis. RPR titer monitoring tracks treatment response – a 4-fold decrease indicates effective treatment.
Window period: tests positive 4-6 weeks post-infection, peak at 6-12 weeks. Concurrent HIV testing is essential due to high co-infection rates.


Benzathine penicillin G is the gold-standard treatment for syphilis worldwide. Treponema pallidum has remained universally penicillin-sensitive since penicillin discovery in the 1940s.
Cure rate: 95% for early stage, lower for late stage. Jarisch-Herxheimer reaction (fever, chills 1-12 hours after first dose) is common but self-limiting.


Untreated syphilis can lead to:


Mens Care Clinic provides same-day RPR/TPHA serology testing and benzathine penicillin G injection. Concurrent HIV, gonorrhea, and chlamydia screening available. Private rooms, male-staff-led environment, three locations: Shimbashi, Akihabara, Omotesando. Toyosu Hospital (Showa University) partnership ensures backup for severe cases requiring IV therapy.


Common questions answered by Mens Care Clinic physicians.
A. Yes – early stage syphilis is curable with single-dose benzathine penicillin G. Cure rate exceeds 95% for primary/secondary stages. Late-stage tertiary complications may be irreversible despite treatment.
A. Cases peaked at over 12,000 in 2022, the highest since 1948. Likely contributors include increased dating app use, decreased awareness, and the painless self-resolving nature of primary chancre.
A. STD clinics, urology, dermatology, infectious disease specialists. Mens specialty clinics combine evaluation with concurrent ED/STI screening in private settings.
A. Blood test combining RPR (non-treponemal, quantifies activity) and TPHA/TP-Ab (specific to T. pallidum). Both positive confirm syphilis.
A. Self-pay typically 15,000-30,000 JPY for initial visit, RPR/TPHA testing, and penicillin injection. Late stage requiring multiple injections costs more.
A. Wait at least 7 days after completed treatment, ideally until RPR titer shows 4-fold decrease (3-6 months post-treatment).
A. Yes – asymptomatic syphilis carriage is common. All sexual partners from past 90 days (primary), 6 months (secondary), or 1 year (early latent) should be tested.
A. No – the primary chancre is characteristically painless, which is why it is often missed and the disease progresses unrecognized.
A. Yes – genital ulcers from syphilis increase HIV acquisition risk 2-5x. Combined HIV/syphilis testing is standard.
A. Mens Care Clinic offers private, confidential testing. Public health centers also offer anonymous free syphilis testing in Japan.


Syphilis is a four-stage progressive STI that is fully curable with penicillin in early stages but may cause irreversible damage if allowed to advance. Given the dramatic resurgence in Japan, all sexually active men should be aware of symptoms – especially the painless primary chancre – and seek prompt testing. Mens Care Clinic offers comprehensive STD evaluation in a private, men-only setting with same-day testing and treatment.
Medically reviewed by
Masashi MoritaPhysician
This article has been reviewed by a doctor for medical accuracy. Individual symptoms are assessed by a doctor at consultation.
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