Syphilis changes its appearance dramatically depending on how long you’ve had it. In its earliest stage, it shows up as a single, small, painless sore. In its second stage, it produces a widespread rash that often appears on the palms of your hands and soles of your feet. Left untreated for years, it can cause soft, tumor-like growths inside the body. Each stage looks different enough that many people don’t realize they’re all the same infection.
The First Stage: A Single Painless Sore
The first visible sign of syphilis is a small sore called a chancre (pronounced “SHANG-kur”). It appears at the spot where the bacteria entered your body, most commonly on the genitals, rectum, or mouth. The sore is firm, round, and usually painless, which is the single most important thing to know about it. Because it doesn’t hurt, many people never notice it at all.
A chancre typically shows up about three weeks after exposure, though the timing can vary. It heals on its own within 3 to 6 weeks whether or not you get treated. This self-healing is deceptive: the infection hasn’t gone away, it’s just moved deeper into your body. If you spot a firm, painless sore on your genitals or mouth that you can’t explain, that’s the moment to get tested.
How It Differs From Herpes
People often confuse a syphilis sore with a herpes outbreak, but the two look and feel quite different in their typical forms. A syphilis chancre is usually a single, firm, painless ulcer. Herpes lesions are typically multiple, painful blisters that cluster together. That said, both infections can present atypically, so visual inspection alone isn’t reliable for diagnosis. A blood test or swab is the only way to know for sure.
The Second Stage: Rash and Mouth Sores
If the first stage goes untreated, secondary syphilis develops weeks to months later. This stage is far more visible. The hallmark is a skin rash that can appear across the torso, arms, and legs, but what makes it distinctive is its tendency to show up on the palms and soles. Most common rashes spare these areas, so a rash on your palms is a red flag worth taking seriously. The rash is generally not itchy, which is another reason people sometimes dismiss it.
Secondary syphilis can also produce other visible changes. Mucous patches, which are painless, grayish-white erosions, can form inside the mouth, on the tongue, or on the genitals. These appear in roughly 5 to 30 percent of secondary syphilis cases. In warm, moist areas like the groin or around the anus, flat, moist, wart-like growths called condylomata lata can develop. These are sometimes mistaken for genital warts, but they look different: condylomata lata tend to be flatter, smoother, and more moist than the rough, cauliflower-textured growths typical of genital warts.
Other symptoms during this stage include swollen lymph nodes, fever, fatigue, and patchy hair loss. Like the chancre before it, these symptoms eventually resolve on their own, even without treatment. But again, the infection is still active and progressing silently.
The Latent Stage: No Visible Signs
After secondary symptoms clear, syphilis enters a latent (hidden) phase where there are no visible signs at all. This stage can last years or even decades. You’d have no idea you were infected based on appearance alone. The only way to detect latent syphilis is through a blood test. During this stage, you can still pass the infection to sexual partners or, if pregnant, to your baby.
The Third Stage: Internal Damage
Tertiary syphilis is rare today but serious. It develops 10 to 30 years after the original infection in people who were never treated. At this point, the disease causes damage you can’t always see from the outside.
One visible sign of tertiary syphilis is the gumma, a soft, tumor-like growth made up of dead, swollen tissue. Gummas most commonly form in the liver, but they can also appear in the skin, bones, brain, heart, eyes, and testicles. On the skin, they look like firm nodules or ulcers that can grow quite large.
Tertiary syphilis can also affect the brain and nervous system. Early neurological involvement can cause vision problems, hearing changes (including sudden hearing loss and ringing in the ears), and symptoms of meningitis. Late neurological damage, occurring decades after infection, can affect coordination, sensation, and mental function. Eye involvement often presents as inflammation inside the eye and can occur at any stage of the disease, not just the tertiary phase.
What Syphilis Looks Like in Newborns
Syphilis can pass from a pregnant person to their baby, a condition called congenital syphilis. Infected newborns may develop skin rashes shortly after birth, along with other serious complications affecting the bones, liver, and nervous system. Some babies show no symptoms at birth but develop problems later in childhood. Congenital syphilis cases have been rising in recent years, making prenatal screening especially important.
Why Syphilis Is Easy to Miss
The biggest challenge with identifying syphilis by appearance is that it mimics other conditions at nearly every stage. The chancre can look like an ingrown hair or a harmless bump. The secondary rash can resemble an allergic reaction or another viral illness. Mucous patches can be mistaken for canker sores. Condylomata lata get confused with genital warts. Syphilis has historically been called “the great imitator” for exactly this reason.
Adding to the difficulty, the primary chancre can appear in places that are hard to see, like inside the vagina, on the cervix, or inside the rectum. It can also appear on the lips, tongue, or fingers. In all of these locations, it keeps the same firm, painless quality, but its hidden location means many people go through the entire first stage without ever seeing it. If you think you may have been exposed to syphilis, testing is more reliable than trying to identify it visually.