Most STDs have distinct visual signs, but many share overlapping features like bumps, sores, or unusual discharge. Some look alarming but are harmless, while others can appear so mild you barely notice them. Here’s what the most common STDs actually look like on the body, how to tell them apart, and when symptoms typically show up after exposure.
Syphilis: Sores, Then a Rash
Syphilis progresses through stages, and each one looks different. The first sign is a single, firm, round sore called a chancre. It’s usually painless, which is part of what makes it easy to miss. Chancres can appear on the genitals, inside the vagina, on the tongue, or around the anus. They typically show up about 3 weeks after exposure, though the window ranges from 10 to 90 days. A chancre will heal on its own within a few weeks, but the infection hasn’t gone anywhere.
If untreated, syphilis moves into its secondary stage. This is when a rash appears, often on the palms of the hands or the soles of the feet, which is unusual for most skin conditions. The rash can also spread across the back, chest, and limbs. It’s typically not itchy, and the spots may be rough, reddish-brown, or subtle enough to overlook. Some people also develop flat, moist lesions around the genitals or mouth during this stage.
Genital Herpes: Blisters That Break Open
A herpes outbreak follows a predictable pattern. It starts with a tingling, stinging, or itching sensation in the genital area, sometimes a day or two before anything becomes visible. Then small, fluid-filled blisters appear, clustered together on or around the genitals, anus, or mouth. These blisters eventually burst and leave behind painful red sores that can look like cracked or raw skin. Over the next week or two, the sores crust over and heal.
The first outbreak is usually the worst, often accompanied by flu-like symptoms, swollen lymph nodes, and body aches. Later outbreaks tend to be milder and shorter. Symptoms typically appear about 4 days after exposure, though the range is 2 to 12 days. Many people with herpes have outbreaks so mild they mistake them for razor burn or irritated skin.
Genital Warts From HPV
Genital warts are flat or slightly raised bumps that appear on the skin’s surface. They’re usually flesh-colored or close to your natural skin tone, though they can also be pearly, dark purple, brown, or gray. The surface feels bumpy or rough to the touch. When several warts cluster together, they can take on a cauliflower-like texture and shape.
Some genital warts are so small and flat they’re nearly invisible. They may appear as a single bump or grow in small groups. Warts can show up anywhere from 3 weeks to many months after exposure, which makes tracing them to a specific encounter difficult. In people with weakened immune systems, warts can multiply into larger clusters, but this is uncommon.
Telling Warts Apart From Normal Skin
Genital warts are easy to confuse with harmless skin features. Skin tags, for instance, are soft, flesh-colored growths that hang off the skin on a tiny stalk. When you press a skin tag, it bends easily and feels soft. Genital warts, by contrast, sit flat or slightly raised against the skin and feel rough or bumpy on the surface. Warts don’t dangle or hang the way skin tags do.
Ingrown hairs and folliculitis (infected hair follicles) can also mimic STD symptoms. These tend to form around individual hair follicles, often with a visible hair trapped inside or a white pus-filled head, similar to a pimple. Genital warts don’t have pus and aren’t centered on hair follicles. Fordyce spots, the tiny pale dots many people have naturally on their lips or genitals, are another common source of worry. They’re completely normal oil glands and are uniform, flat, and painless.
Molluscum Contagiosum: Dimpled Bumps
Molluscum produces round, raised, skin-colored bumps with one signature feature: a small dent or dimple right in the center. This central indentation is the key identifier. The bumps are small, typically under a quarter inch across, and can appear pink or pearly. They sometimes itch but aren’t painful. In adults, molluscum spread through sexual contact tends to appear on the genitals, inner thighs, and lower abdomen. Symptoms take anywhere from 2 weeks to 6 months to show up.
Gonorrhea, Chlamydia, and Trichomoniasis
These three infections don’t produce sores or bumps. Instead, they primarily cause abnormal discharge and discomfort. Gonorrhea and chlamydia can produce cloudy, yellow, or green discharge from the vagina or penis. In men, gonorrhea often causes a noticeable, thick discharge and burning during urination. Chlamydia is frequently milder or completely silent, particularly in women, where up to 70% of cases produce no obvious symptoms.
Trichomoniasis has a more distinctive discharge: green, yellow, or gray, and often bubbly or frothy. It can also cause a strong, unpleasant odor. Women are more likely to notice trichomoniasis symptoms than men, who often carry the parasite without any visible signs.
Gonorrhea symptoms usually appear within 2 to 8 days, chlamydia within 1 to 3 weeks, and trichomoniasis within 5 to 28 days. All three are curable with antibiotics or antiparasitic medication.
Early HIV Rash
HIV doesn’t cause genital sores or discharge. The earliest visible sign, if one appears at all, is a widespread rash that develops 1 to 2 weeks after infection as part of a flu-like illness. The rash consists of small, flat or slightly raised red spots spread symmetrically across the trunk, limbs, face, palms, and soles. It looks similar to many viral rashes, which is why it’s rarely recognized as HIV without testing.
The rash typically accompanies fever (the most common early HIV symptom), sore throat, swollen lymph nodes, headache, muscle aches, nausea, and fatigue. These symptoms resolve on their own within a few weeks, and the infection can then remain invisible for months to years. Because early HIV mimics the flu so closely, testing is the only reliable way to identify it.
Pubic Lice and Scabies
These parasitic infections are visible on the skin in different ways. Pubic lice (crabs) attach to coarse body hair, particularly in the genital region. You may spot tiny tan or grayish insects clinging to hair shafts, or their even smaller oval eggs (nits) glued near the base of the hair. Intense itching is the primary symptom, and it typically starts within 2 days to 2 weeks of exposure. You might also notice tiny blue-gray spots on the skin where lice have been feeding.
Scabies produces intense itching, especially at night, along with a pimple-like rash. The mites burrow just beneath the skin’s surface, leaving tiny, raised, crooked lines that can appear grayish-white or skin-colored. These burrow tracks are the hallmark of scabies but can be hard to find because there are usually only 10 to 15 mites present on the entire body. Common locations include between the fingers, on the wrists, around the waistline, and in the genital area.
When Symptoms Show Up
One of the trickiest things about STDs is the gap between exposure and visible signs. Here’s how long symptoms typically take to appear:
- Herpes: 2 to 12 days, average 4 days
- Gonorrhea: 2 to 14 days
- Chlamydia: 1 to 3 weeks
- Syphilis: 10 to 90 days, average 21 days
- Trichomoniasis: 5 to 28 days
- Genital warts (HPV): 3 weeks to many months
- Molluscum contagiosum: 2 weeks to 6 months
- HIV: flu-like illness in 1 to 2 weeks, then silent for months to years
- Hepatitis B: usually 6 weeks, up to 6 months
- Pubic lice: 2 days to 2 weeks
Many STDs produce no visible symptoms at all, particularly chlamydia, gonorrhea in women, HPV, and early HIV. Looking for visible signs is a reasonable starting point, but it’s not a substitute for testing. Plenty of infections look like nothing.