Best STD Specialist for Genital Ulcers in Kathmandu The Ulcer Differential — Resolved Correctly
A genital ulcer is the symptom where the differential genuinely matters — syphilis and herpes look alike to a layperson but are different diseases with different stakes. Correct diagnosis at Thamel Clinic resolves it properly.
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Reviewed by: STD Specialist (MBBS, MD - Medicine)
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Last medical review: June 1, 2026
This content follows evidence-based medical guidelines and is regularly updated to reflect current medical practices.
Ulcer Mis-Diagnosis in Nepal
- Syphilis missed as herpes — the commonest dangerous error; painless chancres dismissed.
- Herpes over-called — any genital sore labeled herpes without testing.
- No serology run — ulcers treated topically while RPR was never checked.
- Non-infectious ulcers treated as STI — trauma and drug eruptions given antivirals.
The Symptom Where Guessing Is Dangerous
A genital ulcer is not "herpes until proven otherwise" — the differential is real and consequential: syphilis chancre (painless, indurated — the dangerous miss), herpes (painful, grouped, recurrent), chancroid (ragged, suppurative), trauma, fixed drug eruption, aphthae, and — rarely — malignant ulcers. Each has a different treatment and a different implication; treating the wrong one is worse than not treating.
The dangerous direction: an ulcer assumed "herpes" or "minor" that was actually syphilis — missed early syphilis progresses. The wasteful direction: ulcers treated as herpes that were trauma or fixed drug eruption — unnecessary antivirals and ongoing anxiety.
This page covers the ulcer differential, how the diagnosis is made, and the treatment per cause.
The Ulcer Differential
Syphilis chancre
Single, painless, indurated (firm button-like base), clean — the dangerous miss; paired serology confirms.
Herpes
Grouped painful vesicles → shallow ulcers; often recurrent at the same site; lesion PCR confirms.
Chancroid
Ragged painful ulcer, suppurative, tender nodes — H. ducreyi; culture/PCR.
Trauma
Friction or injury-related; heals without treatment; pattern lacks vesicular stage.
Fixed drug eruption
Recurs at the identical site on re-exposure to the drug; dusky plaque rather than grouped vesicles.
Other
Aphthae, Behcet's, Lichen planus, malignancy — the long tail a specialist considers.
How the Diagnosis Is Made
- Examination — morphology (pain, induration, grouping, base) narrows the list substantially.
- Syphilis serology — RPR/VDRL + TPHA run on every genital ulcer — the dangerous diagnosis excluded routinely.
- Lesion PCR — herpes confirmed while the lesion is fresh.
- HIV test — ulcerative STIs increase HIV risk; the two are tested together.
- Follow-up — non-healing ulcers get biopsy consideration; the malignant mimic never assumed away.
Ulcer Urgency
Genital ulcers warrant prompt (days, not weeks) evaluation — the syphilis window and the fresh-lesion PCR window both reward early visits. Ulcers with fever, rapidly spreading infection, or immunocompromise are same-day presentations. And every genital ulcer patient is tested for HIV — ulcerative disease multiplies HIV transmission risk.
Ulcer Evaluation & Costs
| Service | What It Includes | Cost (NPR) |
|---|---|---|
| Consultation + examination | Morphology and plan. | Rs. 450 |
| Syphilis serology pair | RPR + TPHA. | Rs. 1,500 – 3,000 |
| Lesion PCR | HSV swab of active lesion. | Rs. 5,000 – 8,000 |
| HIV test | Ag/Ab alongside. | Rs. 1,500 – 3,000 |
| Treatment | Cause-matched. | Rs. 300 – 1,500 + medicines |
Serology and PCR quoted at consult.
Why Ulcers Are Resolved Correctly Here
- The differential run — not "herpes until proven otherwise."
- Syphilis always excluded — the dangerous miss never made.
- Correct confirmation — PCR for herpes, serology for syphilis.
- HIV co-tested — ulcerative disease gets the paired consideration.
- Non-healers escalated — biopsy pathways where the ulcer does not settle.
- Treatment matched — the right drug for the actual cause.
Frequently Asked Questions
Is a genital ulcer always an STD?
No — trauma, fixed drug eruption and non-infectious causes exist; but every ulcer gets syphilis serology because that is the one that cannot be missed.
How do doctors tell herpes from syphilis?
Morphology plus testing — syphilis chancres are typically painless and indurated; herpes ulcers are painful and grouped; serology and PCR confirm respectively.
Should I wait to see if it heals?
No — fresh-lesion PCR is time-sensitive and early syphilis is early only briefly; ulcers warrant prompt evaluation.
Can an ulcer be something serious?
Usually not — but the rare serious causes (syphilis, malignancy) are exactly why the differential matters.
Why is HIV tested with an ulcer?
Ulcerative STIs increase HIV acquisition/transmission risk — the paired test is standard practice.
Still have questions? Contact us or book an appointment for personalized guidance.
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Last Updated: October 19, 2026 |Clinic: Thamel Clinic |Licensed: Registered