References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Herpes isn’t the only cause of genital or oral blisters, sores and irritation. Several other conditions can look similar and are often mistaken for herpes — including shingles, syphilis, folliculitis, contact dermatitis and other skin conditions. Proper testing or examination can usually tell the difference.
Here’s a practical guide.
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Conditions Often Mistaken for Herpes
| Condition | Key Differences |
|---|---|
| Folliculitis or ingrown hairs | Red bumps around hair follicles; more common after shaving |
| Contact dermatitis | Red itchy patches from irritants; not blistering in same pattern |
| Syphilis chancre | Single painless firm ulcer |
| Chancroid | Painful genital ulcer (rare in UK) |
| Yeast infection | White discharge, itching; usually no blisters |
| Aphthous ulcers | Painful mouth ulcers inside the mouth, not on lips |
| Shingles | Painful blisters in a band pattern on one side of the body |
| Allergic reaction | Itchy rash or hives from contact with irritant |
| Molluscum contagiosum | Small dome-shaped flesh-coloured bumps |
| Genital warts | Flesh-coloured growths, usually not blisters |
| Lichen sclerosus | Chronic white patches, itching |
How to Tell the Difference
Herpes features
- Cluster of small painful blisters
- Blisters burst into shallow ulcers
- Crust over and heal within 7-14 days
- Tingling or burning before blisters appear
- Can recur, often in the same location
When it’s probably not herpes
- Single painless ulcer — think syphilis
- Itchy red patches without blisters — think dermatitis or yeast
- Red bumps with hair follicles — think folliculitis
- Severe one-sided pain in a band pattern — think shingles
- Growths rather than sores — think warts or molluscum
Getting a Proper Diagnosis
The most reliable way to diagnose herpes is to swab an active blister or ulcer for PCR testing. If you have a suspicious lesion:
- Don’t pop, scratch or pick at it
- Contact a sexual health clinic promptly
- Get it swabbed while fresh — accuracy drops as lesions heal
- Discuss other possible causes with the clinician
Why Accurate Diagnosis Matters
- Different conditions need different treatment
- Syphilis treatment is completely different from herpes
- Folliculitis may need antibiotics or just better shaving habits
- Dermatitis often needs topical steroids, not antivirals
- An accurate diagnosis affects decisions about partners and disclosure
When a Herpes Diagnosis Is Wrong
Visual diagnosis without testing is not always accurate. If you were diagnosed with herpes without a positive swab or blood test, and the symptoms don’t fit, ask about testing to confirm.
Read more: What is herpes? | Home herpes tests | Cold sores vs syphilis
Frequently Asked Questions
Can I diagnose herpes by looking at it?
Not reliably. Many conditions can look similar. Testing gives certainty.
What if my test is negative but I have sores?
Other conditions may be the cause. Your clinician can investigate further.
Can shingles look like genital herpes?
Shingles can occur on the buttocks or genital area and cause painful blisters, though usually in a band pattern on one side of the body.
Related reading
- Can You Get Herpes From a Toilet Seat?
- Can You Get Herpes From Kissing?
- Comprehensive Test: Chlamydia, Gonorrhoea and Herpes
- Cold Sores vs Syphilis Sores: How to Tell the Difference
- Genital Warts vs Herpes: What's the Difference?
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
