Syphilis is a curable bacterial STI caused by Treponema pallidum. Caught early, syphilis treatment is straightforward — a single penicillin injection cures it. The real danger is its silence — the sore heals on its own and the infection hides for years, quietly damaging the heart, brain and nerves if it is never treated.
Vanakkam. As a practising andrologist in Chennai, let me say the most important thing first, before the worry takes over: this is one of the very few sexually transmitted infections that we can genuinely cure. Not “manage.” Cure. So take a breath, and let me walk you through exactly what syphilis is, what it looks like in men, how the blood tests work, and how we treat it stage by stage.
Quick Facts about syphilis
- Cause: the bacterium Treponema pallidum; spread mainly through vaginal, anal or oral sex, and from mother to baby.
- First sign: a single, painless sore (chancre) on the penis, scrotum, anus or mouth, about 3 weeks (range 10–90 days) after exposure.
- It is curable — penicillin works at every stage; the earlier you catch it, the simpler the cure.
- It hides: the sore and the rash heal on their own, but the bacteria stay. Only a blood test (VDRL/RPR + TPHA) confirms cure.
- Test, don’t guess: a positive VDRL needs a TPHA to confirm, and the titre is followed over time to prove you are cured.
Everything that matters, in 60 seconds
The essentials an andrologist wants every man to know — what it is, what it does, and why it is completely curable when caught.
How it spreads
Through vaginal, anal and oral sex, and from mother to baby. Kissing can pass it on if there is an active mouth sore. Symptoms appear about 3 weeks after exposure (range 10–90 days).
The first sign
A single, painless sore (chancre) on the penis, scrotum, anus or mouth. It heals on its own in 3–6 weeks — but the infection has not gone anywhere.
The four stages
Primary sore → secondary rash (classically on palms and soles) → latent silent years → tertiary/neurosyphilis. It goes quiet, then returns years later if ignored.
If left untreated
Can cause neurosyphilis (stroke, dementia-like illness), heart and aorta damage, blindness and pregnancy loss — every one of them preventable.
The cure
Curable at every stage. Benzathine penicillin G 2.4 million units IM — one injection for early syphilis, three weekly doses for late latent (CDC 2021).
How it is diagnosed
Two blood tests together: VDRL/RPR gives a titre that tracks activity; TPHA confirms it and stays positive for life. A four-fold titre drop after treatment means cure.
What is syphilis?
Syphilis is an infection caused by a corkscrew-shaped bacterium called Treponema pallidum. Doctors have nicknamed it “the great imitator” for a simple reason — it can mimic almost any skin disease, any rash, even neurological illness, which is exactly why it gets missed so often (Šmajs, 2026).
Here’s the honest answer about why this page matters now: syphilis is not a disease of the past. Over the last decade, cases have surged worldwide (Rosset, 2025). In the United States alone, infections rose by 61% between 2019 and 2023 (Chevalier, 2025). In South Korea, the sharpest rise has been among men in their 20s and 30s (Kim, 2026) — and in my clinic, I see this every week, the very same pattern walking through the door.
What makes syphilis different from most STIs is that it moves through distinct stages. It does not just sit there. It announces itself, then goes quiet, then — if ignored — comes back years later in a far more dangerous form. This page covers both halves of your question: the symptoms and stages, and the treatment.
What are the symptoms of syphilis in men? (by stage)
Syphilis unfolds in four phases. Understanding the stage you are in tells us how to treat you, so let me take them one at a time.
Primary stage: the painless sore
The first sign of syphilis in men is a single sore called a chancre. It appears on average about 3 weeks after exposure — anywhere from 10 to 90 days — typically on the penis, scrotum, anus or mouth (Chevalier, 2025).
Here is the trap, and it is the most important sentence on this page: the chancre is painless. It does not hurt, it does not itch, and it heals by itself in three to six weeks. So most men think it was nothing — a small ulcer that went away. But the bacteria did not go away. They went deeper.
Secondary stage: the rash on palms and soles
A few weeks to a few months later, the infection comes back as a body-wide rash — and this is the classic giveaway. The rash is usually not itchy, reddish-brown, and famously shows up on the palms of the hands and the soles of the feet, which almost no ordinary rash does (Chevalier, 2025).
Alongside the rash you may get moist patches in the mouth or genitals (mucous patches), wart-like lesions called condyloma lata, low fever, swollen lymph nodes, and patchy hair loss. Syphilis can also show up in the mouth at this stage, where it is frequently mistaken for something else entirely (Barreto, 2025; Abdelrehim, 2025). Again — all of this heals on its own. And again — you are still infected.
Latent stage: the silent years
After the secondary symptoms fade, syphilis goes underground. This is the latent stage — no symptoms at all, only a positive blood test. We divide it into early latent (within the first year, when you can still pass it on) and late latent (after a year). If we genuinely cannot date your infection, we treat it as late latent to be safe (Chevalier, 2025).
Tertiary and neurosyphilis: the serious end
In untreated patients, syphilis can return years later as tertiary syphilis — rubbery growths called gummas, damage to the heart and aorta (cardiovascular syphilis), and neurological disease.
Neurosyphilis deserves its own warning. It can cause stroke, meningitis, psychiatric illness, memory loss, hearing and vision loss, and a spinal-cord disorder called tabes dorsalis (Marra, 2025; Ando, 2026). Critically, neurosyphilis is not only a late-stage event — it can occur at any stage of infection, and the risk is higher in men also living with HIV (Marra, 2025). The eyes can be involved too, sometimes as the very first sign, which is why any unexplained eye inflammation should prompt a syphilis test (Ye, 2025).
How do you get syphilis? (transmission and incubation)
Syphilis spreads through direct contact with an infectious sore during vaginal, anal or oral sex, and from a pregnant mother to her baby through the placenta (Chevalier, 2025). The bacteria slip in through tiny breaks in the skin or mucous membrane — breaks you will never see or feel.
Yes, you can catch it from oral sex, and yes, kissing can transmit it if there is an active sore in the mouth (Barreto, 2025). Condoms reduce the risk substantially but do not fully eliminate it, because a sore can sit on skin the condom does not cover. The incubation period is roughly 21 days, with a wide range of 10 to 90 days (Chevalier, 2025).
If you are also being checked for other infections, it is worth reading our pages on gonorrhea treatment and chlamydia treatment, because these often travel together.
How is syphilis diagnosed? (VDRL, RPR and TPHA explained)
This is the section my patients actually come for. Most men I meet are not frightened of the sore — they are frightened of a lab report that says “VDRL reactive 1:16” and a doctor who didn’t explain it. So let me explain it properly.
Syphilis is diagnosed with two kinds of blood test used together — and you genuinely need both (Kim, 2026). One screens and tracks the disease; the other confirms it. Here is how they differ.
| VDRL / RPR (non-treponemal) | TPHA / TPPA / FTA-ABS (treponemal) | |
|---|---|---|
| Main use | Screening + monitoring activity | Confirming a positive screen |
| Gives a titre? | Yes (e.g. 1:2, 1:8, 1:32) | No — not used for monitoring |
| After cure | Falls (4-fold drop) or stays low (serofast) | Usually stays positive for life |
| Answers the question | “Is it active? Is the treatment working?” | “Have I ever had syphilis?” |
Non-treponemal tests (VDRL / RPR)
The VDRL and RPR are the screening and monitoring tests. Their great strength is that they give a titre — a number like 1:8 or 1:32 — that rises when the disease is active and falls when treatment is working. They are positive in most, but not all, cases at every stage, which is exactly why we never rely on them alone (Xie, 2026).
Treponemal tests (TPHA / TPPA / FTA-ABS)
The TPHA and its cousins are the confirmation tests. If your VDRL is positive, a TPHA tells us whether it is truly syphilis or a false alarm. The classic teaching is that these tests stay positive for life, even after a complete cure — so a positive TPHA after treatment is expected and does not mean you are still infected. (Newer evidence shows treponemal positivity can occasionally fade in some patients, but for practical purposes you should assume yours stays positive forever (Xie, 2026).)
What do the titres mean (1:2, 1:8, 1:32)?
Here is the plain answer to the most-asked question in my clinic. A higher titre means more active disease — 1:32 is more active than 1:8. But — and please hear this — your titre is not your stage, and it is not your verdict. We diagnose the stage clinically, then we use the titre to track you.
The rule we actually treat by is the four-fold change (two dilutions). A four-fold drop — say from 1:32 down to 1:8 — after treatment means the treatment is working. A four-fold rise means relapse or a fresh re-infection (Xie, 2026). So if you are holding a “1:32” report and panicking: it is treatable, it is trackable, and the number is going to come down once we treat you.
Serofast reaction
Some men get fully treated and their VDRL drops but then stalls at a low level — say 1:2 or 1:4 — and simply will not become negative. This is called a serofast state. It does not mean the treatment failed and it does not mean you need re-treatment (Xie, 2026). It is a known, harmless tail.
When is a lumbar puncture (CSF test) needed?
We do not tap the spinal fluid of every patient. A lumbar puncture is reserved for specific situations: neurological or eye symptoms, suspected treatment failure, or certain HIV co-infections (Marra, 2025). Most men reading this will never need one.
Syphilis treatment by stage
Now the part you came for. The first-line treatment for syphilis at every stage is benzathine penicillin G — an injection, not tablets (Chevalier, 2025). What changes with the stage is the number of doses. The regimens below follow the current CDC STI Treatment Guidelines (2021); please note this corrects the older 2010-era dosing on the previous version of this page.
| Stage | First-line regimen | Notes |
|---|---|---|
| Primary, secondary, early latent (under 1 year) | Benzathine penicillin G 2.4 million units IM, single dose | One injection cures early syphilis |
| Late latent / unknown duration / tertiary (non-neuro) | Benzathine penicillin G 7.2 million units total = three doses of 2.4 million units IM, one week apart | Three weekly injections |
| Neurosyphilis / ocular / otic | Aqueous crystalline penicillin G 18–24 million units/day IV for 10–14 days | Admitted, intravenous treatment |
That single injection for early syphilis is what I want you to remember. One dose, one cure (Chevalier, 2025). For late latent disease, it is three weekly injections (Chevalier, 2025). For neurosyphilis it is intravenous penicillin in hospital for 10–14 days (Marra, 2025; Ando, 2026).
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What if I’m allergic to penicillin?
First, do not let a penicillin allergy frighten you out of treatment — we have a clear plan. For early syphilis in a non-pregnant patient, doxycycline 100 mg twice daily for 14 days is the standard alternative, and ceftriaxone is another option (Ye, 2025).
But here is the important nuance: for neurosyphilis, ocular syphilis and pregnancy, the alternatives are weaker, so the preferred path is penicillin desensitisation — we carefully retrain your body to tolerate penicillin and then give the real drug (Ye, 2025). A note of caution on azithromycin: because of macrolide resistance and documented treatment failures, it is not a reliable first choice and we generally avoid it.
The Jarisch-Herxheimer reaction (don’t panic after your injection)
Let me tell you about something that scares people unnecessarily. Within a few hours of your first penicillin injection, you may get fever, chills, headache, and the rash may briefly look worse. This is the Jarisch-Herxheimer reaction — and it is a good sign (Ye, 2025).
It is not an allergy. It happens because the antibiotic is killing the bacteria rapidly and your body reacts to the debris. It is most common when treating secondary syphilis, it typically settles within 24 hours, and it means the drug is working. So if it happens to you, do not stop, do not rush to the ER in a panic — it passes.
Follow-up: how do you know you’re cured?
We do not just inject you and wave goodbye. We prove the cure with repeat VDRL/RPR titres, usually at 6 and 12 months after treatment (Chevalier, 2025). A four-fold drop in the titre is success (Xie, 2026).
Two reminders that save a lot of needless worry. One: your treponemal test (TPHA) stays positive — do not let any doctor re-treat you on a positive TPHA alone. Two: if you land in a low-level serofast state, that is fine and does not need re-treatment (Xie, 2026).
The men I see are rarely scared of the sore — it was painless and gone before they ever worried about it. They come in months later holding a “VDRL reactive 1:16” report, terrified. Two things I tell every one of them. First, this is one of the few STIs we can genuinely cure, often with a single injection. Second, your titre is not your verdict — we treat by stage, then we watch the number fall. And please, bring your partner. Treating you while leaving her untested just sends the same infection straight back to you a few months later. None of this, by the way, has anything to do with the harmless habits men worry about — if guilt is part of your fear, read our piece on masturbation side effects and myths and let that one go.
Syphilis, pregnancy and your baby (congenital syphilis)
This is where syphilis stops being only your problem. Congenital syphilis — infection passed to the baby — has been rising alarmingly, climbing 106% in the US between 2019 and 2023 (Chevalier, 2025). Up to 40% of fetuses exposed in the womb are stillborn or die in infancy (Chevalier, 2025). It is one of the routinely screened-for infections in pregnancy precisely because catching it early prevents this tragedy (Pawlak-Zalewska, 2026).
Every pregnant woman should be screened, and current guidance is to test three times — at the first visit, in the third trimester, and at delivery (Chevalier, 2025). Treatment in pregnancy is penicillin, and if the mother is allergic we desensitise her rather than substitute a weaker drug (Ye, 2025). The andrology angle is simple and non-negotiable: if you are the male partner, you must be tested and treated too, or you will keep re-infecting her and the baby.
Syphilis rarely travels alone: HIV, chlamydia, gonorrhoea and herpes
In my clinic, syphilis is almost never the only thing I find. The very same exposure that passes on Treponema pallidum readily brings other infections along with it — so a positive syphilis test is a reason to screen for the whole panel, not just to treat the one result in front of you.
The infections I most commonly see alongside syphilis are HIV, chlamydia, gonorrhoea and, in a fair number of men, genital herpes. Co-infection with HIV is especially common, and it is not a minor footnote: HIV raises both the risk and the complexity of neurosyphilis, and syphilis in turn makes acquiring and transmitting HIV easier (Chevalier, 2025; Marra, 2025). That two-way street is exactly why a syphilis diagnosis should trigger a full sexual-health work-up every time.
So when I diagnose syphilis, I offer a complete STI screen the same day — HIV, chlamydia and gonorrhoea (one NAAT covers both), herpes where there are symptoms, and hepatitis B and C. If you have tested positive for syphilis, please read and act on our companion guides: chlamydia symptoms and treatment in men, gonorrhea symptoms and treatment, and our broader STD clinic overview. Treating one infection while ignoring the others simply leaves the door open for reinfection and silent damage.
Who is most at risk
Let me be direct here, without any judgment, because honesty is what actually protects you. Syphilis spreads fastest in a few clear situations: men who have sex with men (MSM), and men who have frequent contact with new or anonymous partners — including those who regularly visit commercial sex workers or escorts. The common thread is never who you are; it is repeated, condomless contact with partners whose infection status you do not know. If that describes your life right now, then even with no symptoms at all, regular screening is not optional — it is the single most effective thing you can do, precisely because (as you have read) the most dangerous stages of syphilis are completely silent.
Complications of untreated syphilis
I never use fear as a tactic, but you deserve the truth so the choice to treat is an easy one. Left untreated, syphilis can lead to cardiovascular damage, neurosyphilis with stroke and dementia-like illness, gummas, blindness, hearing loss, and pregnancy loss (Marra, 2025; Ye, 2025; Chevalier, 2025). It also makes acquiring HIV easier. Every one of these outcomes is preventable with a treatment that, for early disease, is a single injection.
Prevention and partner treatment
Prevention is straightforward: consistent condom use, mutual testing before a new relationship, and treating every recent sexual partner so the infection cannot bounce back to you (Chevalier, 2025). For men at ongoing high risk, doxycycline post-exposure prophylaxis — 200 mg taken within 72 hours of sex — is an emerging, evidence-based prevention strategy (Chevalier, 2025).
Partner notification is not optional. If you are diagnosed, your recent partners need testing and treatment. Abstain from sex for at least 7 days after single-dose treatment and until your partners are treated.
When should you see a doctor?
See a doctor promptly if you have any painless genital sore, an unexplained body rash — especially one on the palms or soles — a positive or borderline VDRL report, or a partner who has just been diagnosed with syphilis. Do not wait for the sore to “decide” anything; by the time it disappears, the infection has already moved inward.
If you would like an experienced andrologist to read your report and guide your treatment, you can reach my clinic directly.
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Frequently asked questions about syphilis
Is syphilis curable?
Yes. Syphilis is curable at every stage with penicillin, and the earlier it is caught, the simpler the cure — often a single injection for early disease (Chevalier, 2025).
What is the first sign of syphilis in men?
A single, painless sore called a chancre, usually on the penis, scrotum, anus or mouth, appearing about three weeks after exposure (Chevalier, 2025).
How long after exposure do symptoms appear?
Usually around 3 weeks, with a range of 10 to 90 days (Chevalier, 2025).
Does the syphilis sore hurt?
No. The chancre is typically painless and heals on its own — which is exactly why it is so easily missed (Chevalier, 2025).
What does the syphilis rash look like?
Non-itchy reddish-brown spots that classically appear on the palms of the hands and soles of the feet, often with fever and swollen glands (Chevalier, 2025).
What is the difference between VDRL, RPR and TPHA?
VDRL and RPR are screening and monitoring tests that give a titre to track activity; TPHA confirms the diagnosis and usually stays positive for life (Xie, 2026; Kim, 2026).
My VDRL titre is 1:32 — which stage am I in, and is it curable?
Your titre shows how active the infection is, not which stage you are in, and not whether it is curable — it absolutely is. We decide the stage clinically, treat you, then watch the titre fall (Xie, 2026).
Will my VDRL/TPHA become negative after treatment?
Your VDRL usually drops four-fold or more, which signals cure, but the TPHA can stay positive for life. A low, stable VDRL afterwards (serofast) does not mean treatment failed (Xie, 2026).
How is syphilis treated?
With a benzathine penicillin G injection — a single 2.4-million-unit dose for early syphilis, or three weekly doses for late latent disease (Chevalier, 2025).
What if I’m allergic to penicillin?
Doxycycline for 14 days is the usual alternative for early syphilis, but for pregnancy and neurosyphilis we prefer to desensitise you to penicillin rather than use a weaker drug (Ye, 2025).
Can you get syphilis from kissing or oral sex?
Yes. Oral sex commonly transmits syphilis, and kissing can spread it when an active sore is present in the mouth (Barreto, 2025).
Do I need to tell and treat my partner?
Yes. Partner testing and treatment is essential — without it, you simply re-infect each other in a loop (Chevalier, 2025).
