When syphilis was first described in detail by 19th-century physicians, they called it “the great imitator” — and the name has stuck for good reason. Few diseases in modern medicine progress through such distinct stages, with such varied symptoms, that mimic so many other conditions along the way.
Most patients we diagnose with syphilis at our KL clinic come in not knowing they have it. They have a strange rash. A persistent sore that healed on its own. Patchy hair loss. Vague flu-like symptoms. By the time they’re sitting in our consultation room, they’ve often consulted a GP, been treated for a viral infection, or simply waited it out for weeks. The diagnosis is often a surprise.
This article walks through the four stages of syphilis — what each looks like, why they matter, and why catching it early makes the entire difference between a one-injection cure and decades of potentially serious complications. If syphilis is anywhere on your radar, this is worth understanding completely.
What Syphilis Is
Syphilis is caused by a spiral-shaped bacterium called Treponema pallidum. It’s transmitted primarily through sexual contact — vaginal, anal, or oral sex with an infected partner — and from mother to baby during pregnancy or childbirth (congenital syphilis).
It’s a bacterial infection, which means it’s curable with antibiotics — most commonly penicillin. But unlike most bacterial infections, syphilis has a fascinating ability to remain in the body for years or decades after the initial infection, slowly progressing through stages even when no symptoms are visible. This is what makes it both treatable (because antibiotics work) and dangerous (because it’s so easy to miss).
Syphilis cases have been rising in Malaysia and globally over the past decade, after several decades of relatively low rates. Multiple factors contribute, including reduced public awareness compared to HIV, increased sexual networks via online platforms, and reduced fear of consequences in an era of effective HIV treatment.
The Four Stages of Syphilis
Syphilis progresses through four distinct stages if left untreated. Understanding these stages is the key to recognising the disease.
Stage 1: Primary Syphilis
Primary syphilis is the initial stage, beginning 10 to 90 days after exposure (average around 3 weeks). This is when treatment is simplest and recovery is essentially complete.
The chancre.
The defining sign of primary syphilis is a sore called a chancre. The classic chancre is:
- A single, round sore (sometimes more than one in some cases)
- Painless — this is the catch that makes people miss it
- Has firm, well-defined edges
- May appear slightly raised or as a small ulcer with a smooth base
- Located wherever the bacterium entered — penis, vulva, vagina, anus, mouth, throat, or even fingers
Why it’s missed.
The chancre heals on its own within 3 to 6 weeks even without treatment. Many patients see it disappear and conclude they were fine. They weren’t — the bacteria are still in the body, beginning to spread.
If located internally (inside the vagina, anus, or rectum), the chancre may never be visible. The patient never sees it, doesn’t know it existed, and proceeds through the rest of the stages without ever knowing the original infection happened.
Treatment at this stage.
Primary syphilis is curable with a single intramuscular injection of penicillin (benzathine penicillin G, 2.4 million units). Cure rate is essentially 100% with proper treatment. No long-term effects.
Stage 2: Secondary Syphilis
Secondary syphilis develops weeks to a few months after the primary chancre heals (typically 6 to 12 weeks after initial infection, sometimes longer). This is when the bacteria have spread throughout the body via the bloodstream.
The hallmark rash.
The most characteristic sign of secondary syphilis is a particular rash:
- Reddish-brown, sometimes called “copper-coloured”
- Flat or slightly raised round spots
- Not usually itchy
- Often appears symmetrically on both palms and soles
- Can also spread to the trunk, arms, and legs
- May come and go over weeks if untreated
The palm-and-sole pattern is particularly distinctive — most rashes don’t appear on the palms and soles, so when they do, the differential narrows. This is the rash that often brings patients into clinics, especially when they realise it doesn’t behave like a typical viral or allergic rash.
Other secondary syphilis symptoms.
- Mild flu-like symptoms (low-grade fever, fatigue, headache, body aches)
- Swollen lymph nodes (especially neck, groin, armpits)
- Patchy hair loss in the scalp, eyebrows, or beard
- Mouth ulcers or moist patches in the mouth or genitals
- Sore throat
- Unintentional weight loss
- Eye problems in some cases
Why it’s still often missed.
Secondary syphilis is often misdiagnosed as a viral rash, allergic reaction, eczema, or other skin condition. Many patients see GPs who treat it as something else. The rash also resolves on its own within weeks to months — once again giving the false impression that whatever it was has gone away.
Treatment at this stage.
Secondary syphilis is still curable with a single dose of penicillin in most cases (same regimen as primary). Cure rates remain very high. The body recovers fully — but any visible rash will fade gradually rather than disappearing instantly. Follow-up blood tests confirm successful treatment.
Stage 3: Latent Syphilis
After the secondary stage symptoms fade, syphilis enters a quiet phase called latent syphilis. The bacteria are still present in the body, but there are no obvious symptoms. This stage can last years or decades.
Latent syphilis is divided into two sub-stages.
Early latent (less than 1 year since infection).
Recent infection that has gone underground. Still relatively easy to treat — typically a single dose of penicillin, similar to primary and secondary stages. Risk of transmission to partners is still meaningful.
Late latent (more than 1 year since infection or unknown duration).
Long-standing infection. Treatment requires a longer course — typically three weekly doses of penicillin rather than one. Sexual transmission becomes less likely (though still possible in some cases). Mother-to-child transmission during pregnancy remains a concern.
How latent syphilis is detected.
Because there are no symptoms during latent syphilis, it’s typically caught through:
- Routine STI screening
- Pre-marriage health screening
- Insurance medical examinations
- Pre-pregnancy or pregnancy screening
- Blood donation screening
- Screening that’s part of HIV diagnosis or unrelated medical work-ups
Many patients diagnosed with latent syphilis are completely shocked — they have no idea when they were infected, often have no memory of any chancre or rash, and feel completely well. The blood test simply turns up positive during otherwise routine screening.
Stage 4: Tertiary Syphilis
Tertiary syphilis develops in some untreated patients years to decades after the original infection. This is the stage where significant damage occurs — and importantly, this is also the stage that modern antibiotic treatment in earlier stages prevents almost entirely.
Tertiary syphilis can affect multiple organ systems.
Cardiovascular syphilis.
Damage to large blood vessels, particularly the aorta. Can cause aortic aneurysm and other potentially fatal complications.
Neurosyphilis.
Infection of the brain, spinal cord, and nervous system. Can cause progressive cognitive decline, personality changes, problems with movement and coordination, vision changes, and other neurological symptoms. May develop at any point — even decades — after initial infection.
Gummatous syphilis.
Soft, tumour-like growths called gummas can develop in skin, bones, and internal organs. These can cause significant damage to whatever tissue they affect.
Treatment at this stage.
Tertiary syphilis can still be treated with antibiotics, but damage that has already occurred to organs may not be reversible. The longer treatment courses (typically multiple weekly injections) clear the active infection but cannot undo years of slow accumulating damage.
This is why early detection matters so much. Primary or secondary syphilis caught early = single injection, full recovery. Untreated syphilis decades later = potential serious permanent damage. Same disease. Different outcomes.
How Syphilis Is Diagnosed
Syphilis diagnosis relies primarily on blood tests rather than visual signs (since the visual signs come and go and are easy to miss):
Non-treponemal tests (RPR or VDRL).
Detect substances the body produces in response to syphilis. Useful for screening and for monitoring whether treatment is working. Levels (titres) decrease over time after successful treatment.
Treponemal tests (TPHA or FTA-ABS).
Specifically detect antibodies against the syphilis bacterium itself. Confirm whether you’ve ever had syphilis. Once positive, generally remain positive for life — even after successful treatment.
Combined approach.
Modern syphilis diagnosis typically uses both types of tests together. Different combinations of results indicate different scenarios — current infection, past treated infection, false positives. Your doctor will interpret the results in context.
Direct visualisation of bacteria.
If a chancre or other lesion is present and active, swab samples can sometimes show the bacteria directly under specialised microscopy. This isn’t routine but can confirm primary syphilis when blood tests aren’t yet positive.
Lumbar puncture for neurosyphilis.
If neurosyphilis is suspected, a sample of cerebrospinal fluid may be needed for diagnosis. This is reserved for specific situations and isn’t part of routine syphilis testing.
Window period.
Standard syphilis blood tests become reliable from about 3 to 6 weeks after exposure. Earlier testing may give negative results even when infection is present. Repeat testing at 3 months provides definitive answers.
Why Syphilis Is Rising in Malaysia
Several factors contribute to the recent rise in syphilis cases in Malaysia and globally:
Reduced HIV-related fear.
With effective HIV treatment available, many people now perceive sexual encounters as lower-risk overall — overlooking other STIs that don’t have the same public profile.
Online dating expansion.
Apps and online platforms have increased the number of new sexual partners many people have, with reduced opportunity to know partners’ health backgrounds.
Public awareness gap.
Syphilis was a major public health concern decades ago. As cases dropped, public messaging about it faded. A whole generation of young adults have grown up with little awareness of what syphilis is or how it presents.
Asymptomatic transmission.
Like many STIs, syphilis can be transmitted by people who don’t know they have it. As cases rise, the silent transmission cycle accelerates.
Treatment Timing and Outcomes
To put the importance of timing into perspective:
Primary syphilis was caught and treated.
Single penicillin injection. Cure rate near 100%. Full recovery. No long-term effects.
Secondary syphilis caught and treated.
Single penicillin injection (sometimes more depending on guidelines). Cure rate near 100%. Visible rash fades over weeks. No long-term effects.
Early latent syphilis caught and treated.
Usually single penicillin injection. High cure rate. Patient typically had no symptoms anyway, so no symptom-related recovery needed.
Late latent syphilis caught and treated.
Three weekly penicillin injections. Excellent cure rate. Patient typically had no symptoms. No long-term effects in most cases.
Tertiary syphilis caught and treated.
Multiple injections, sometimes IV antibiotics for neurosyphilis. Active infection cleared. But pre-existing organ damage may not reverse — heart problems remain heart problems, neurological damage may remain.
The gap between “early treatment, complete recovery” and “late treatment, lasting damage” is the entire reason public health systems care so much about catching syphilis as early as possible.
Get Tested at Dr Prevents
If you’ve had any of the symptoms covered in this article—particularly a healed sore that came and went, a hand-and-foot rash, or unexplained patches of hair loss—please come in for testing. At Dr. Prevents, our KL and Selangor clinics offer comprehensive syphilis testing as part of standard STI panels, with results typically returned within 2 to 3 working days.
If you’ve had unprotected sex with a new partner in the past several months and haven’t been tested for syphilis, please consider it. Most cases produce few or no obvious symptoms, and the only reliable way to know is through a blood test. Treatment is genuinely simple when caught early — usually a single injection. The cost of waiting can be far greater.
📞 Catch it early. Treat it simply. Walk in today. 🩺