You noticed a sore that doesn't hurt, or a rash that showed up out of nowhere, and now you're wondering if it could be something serious. Syphilis is one possibility worth ruling out, and the good news is that its early signs are recognizable once you know what to look for.
Syphilis is a bacterial infection that moves through distinct stages, and the symptoms change at each one. Some are easy to miss precisely because they don't cause pain. Here is a plain, stage-by-stage guide to what syphilis looks like, how long each phase lasts, and when to get checked.
What Are the First Symptoms of Syphilis?
The first sign of syphilis is usually a sore called a chancre. It appears at the exact spot where the bacteria entered the body, which is often the genitals, anus, rectum, mouth, or lips. The catch is that this sore is typically painless, so it's easy to overlook or mistake for something harmless.
The chancre doesn't show up right away. The incubation period before it appears is 10 to 90 days, with an average of about 21 days. When it does arrive, it's usually a single, firm, round, painless sore. In about 30% of cases, more than one chancre appears.
- Appears 10 to 90 days after exposure (average around 21 days)
- Usually a single, firm, round, painless sore
- Multiple sores occur in about 30% of cases
- Lasts 3 to 6 weeks and heals on its own, with or without treatment
Why the Sore Heals But the Infection Doesn't
This is the part that trips people up. The primary chancre lasts 3 to 6 weeks and then heals on its own, even if you do nothing. It can disappear without leaving a scar. Many people take this as a sign that whatever it was has resolved.
It hasn't. Syphilis is still in the body, and it moves into the next stage. Because the sore was painless and then vanished, this is one of the most common points where the infection goes untreated. If you've had a sore like this, getting tested is the only way to know for sure.
What Does Secondary Syphilis Look Like?
Secondary syphilis usually begins 2 to 8 weeks after the primary chancre disappears. Its hallmark is a rash, and this rash has a telltale feature: it often appears on the palms of the hands and the soles of the feet, areas where most rashes don't show up. The rash is typically rough or discolored and frequently does not itch.
Secondary syphilis is more than a rash, though. It can bring on a cluster of whole-body symptoms that are easy to blame on a cold or the flu, which is part of why syphilis is nicknamed 'the great imitator.' It mimics many other conditions, including HIV.
- A rash on the palms and soles that often does not itch
- Fever and swollen lymph nodes
- Fatigue, headaches, and muscle aches
- Sore throat and patchy hair loss
- Sores in the mouth, vagina, or anus
The Silent Stage and Long-Term Risks
After secondary symptoms fade, syphilis can enter a latent stage that produces no signs or symptoms at all. This silent phase can last years or even decades. You can feel completely fine while the infection persists.
Without treatment, some people go on to develop tertiary syphilis, the most serious stage. It can cause severe internal damage years after the original infection, including cardiovascular syphilis, soft tissue growths called gummas, and neurosyphilis, which affects the nervous system. The damage at this stage can be permanent. This is why early testing and treatment matter so much.
Syphilis in Pregnancy and Newborns
Syphilis can pass from a pregnant person to their baby, causing congenital syphilis. This is a serious and growing concern. According to the CDC, U.S. newborn syphilis cases rose more than tenfold over the past decade, climbing from 335 cases in 2012 to 3,761 in 2022.
The toll is heavy. The CDC reports that congenital syphilis has included 279 stillbirths and infant deaths, which it calls unacceptably high. There has been one piece of better news at the population level: primary and secondary syphilis, the most infectious stages, recently fell 10%, the first substantial decline in more than two decades. Most congenital syphilis cases are preventable, and routine prenatal testing is the main way to catch and treat the infection before it reaches a baby.
When to See a Doctor
See a clinician if you notice any sore, rash, or symptom described here, especially a painless sore or a rash on your palms and soles. Because the early signs come and go and are often painless, you cannot rely on how you feel to tell you whether the infection is gone.
Get tested if you've had a possible exposure, even without symptoms, and if you are pregnant, ask about syphilis screening as part of prenatal care. Untreated syphilis can eventually affect the brain, nerves, eyes, and heart, so seek prompt medical care for sudden vision changes, severe headache, confusion, or any symptom that feels like an emergency. Syphilis is diagnosed with a simple blood test and is treatable, particularly when caught early. A clinician can confirm the diagnosis and guide treatment. If you'd like help thinking through your symptoms and next steps, a tool like Nolla can point you toward appropriate care.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting any new skincare treatment, especially if you have underlying health conditions, are pregnant, or are taking medications.
