What Do STDs Look Like? Visual Signs Explained
Visible STD signs include clustered fluid-filled blisters (herpes), single painless ulcers (syphilis), cauliflower-like warts (HPV), dome-shaped pearly bumps (molluscum), crawling lice or egg nits on hair (pubic lice), and copper-colored rashes on palms and soles (secondary syphilis). Many STDs — chlamydia, gonorrhea, most HPV — look like nothing at all.
What each STD looks like, infection by infection
| Infection | Typical appearance | Where |
|---|---|---|
| Herpes | Tingling → clusters of small blisters → crusty sores healing in 1–2 weeks | Lip border, genitals, anus |
| Syphilis (primary) | One firm, round, painless ulcer with clean base | Genitals, anus, mouth |
| Syphilis (secondary) | Rough red-brown spots, often palms & soles; moist wart-like patches | Trunk, hands, feet |
| HPV warts | Flesh-toned bumps, sometimes cauliflower clusters | Genitals, groin, anal area |
| Molluscum | Pearly domes with central dimple, 2–5mm | Lower belly, thighs, genitals |
| Pubic lice | Pinhead tan crabs + tiny white eggs glued to hairs | Pubic hair, occasionally brows/lashes |
| Gonorrhea/chlamydia | Usually invisible externally; may see discharge only | Inside urethra/cervix/throat/rectum |
| Trichomoniasis | Redness; 'strawberry cervix' on exam — not self-visible | Vagina, urethra |
Symptoms that accompany these appearances are covered in our signs of an STD guide.
Location differences: men, women, mouth
On men: look for lesions along the shaft, foreskin and scrotum; urethral redness at the tip. On women: external vulvar lesions plus possible internal changes you can't see — vaginal exams catch what mirrors can't. In the mouth: herpes cold sores at the lip line, syphilitic ulcers inside cheeks or on the tongue, and throat gonorrhea that looks identical to ordinary pharyngitis. Our oral STD guide details mouth-specific signs.
Why pictures can't diagnose you
Three reasons visual diagnosis fails: (1) mimics everywhere — folliculitis, ingrown hairs, cysts and normal anatomy copy STD appearances (see eight benign lookalikes); (2) stages vary — a herpes lesion at day two looks nothing like day eight; (3) the worst offenders hide — the infections that damage fertility and health most (chlamydia, HIV, early syphilis) usually show nothing searchable.
Rule of thumb: anything new, painful, blistered, ulcerated or unexplained for more than a few days deserves a professional look — ideally with testing rather than guessing.
Frequently asked questions
Sources & further reading
- 📚 CDC — STI clinical pictures & guidelines — www.cdc.gov/std/treatment-guidelines/clinical-resources.htm
- 📚 DermNet NZ — Genital dermatology atlas — dermnetnz.org/topics/genital-skin-problems
- 📚 ASHA — Understanding HSV — www.ashasexualhealth.org/herpes