Best Herpes Diagnosis in Kathmandu The Ulcer Differential, Correctly Resolved
Genital ulcers have a differential — syphilis, herpes, chancroid, trauma, fixed drug eruption and more — and "looks like herpes" is not a diagnosis. Correct diagnosis at Thamel Clinic combines examination with the right confirmation.
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Reviewed by: STD Specialist (MBBS, MD - Medicine)
NMC Registration:
Last medical review: June 1, 2026
This content follows evidence-based medical guidelines and is regularly updated to reflect current medical practices.
Diagnostic Errors We Correct
- Ulcers labeled herpes without testing — including cases that were syphilis.
- Herpes missed entirely — recurrent ulcers attributed to "ingrown hairs" or "heat."
- IgM misused — the unreliable test producing false labels.
- Type never established — HSV-1 vs. HSV-2 changes the counseling.
- Serology read cold — results interpreted without the history that gives them meaning.
Why Herpes Diagnosis Is Trickier Than It Looks
A group of painful vesicles breaking into shallow ulcers on a red base is classic herpes — but the ulcer differential is real: syphilis chancres are usually painless and indurated, chancroid is ragged and suppurative, trauma lacks the grouped pattern, fixed drug eruption recurs at the same site, and several non-infectious dermatoses mimic all of them. Wrong in either direction is costly — syphilis missed as herpes is the dangerous miss; herpes diagnosed on fear alone creates a false label.
Correct diagnosis layers examination with method-matched confirmation: lesion PCR while a fresh lesion exists; type-specific serology when it does not. The typing itself matters — genital HSV-1 and HSV-2 carry different recurrence and transmission prognoses.
This page explains the diagnostic sequence, the differential it distinguishes, and the interpretation nuances unique to HSV.
The Examination
Characteristic herpes is recognizable: grouped vesicles on a red base, painful, breaking into shallow ulcers, often recurrent at the same site. But the examination also discriminates — the painless indurated chancre of syphilis, the ragged suppurative chancroid, the grouped non-ulcerative molluscum, the fixed recurrence of drug eruption. The eye narrows it to a shortlist; the lab confirms.
Laboratory Confirmation
Lesion PCR
Swab of an active blister/ulcer — definitive while fresh, returning HSV-1 or HSV-2 type.
Type-specific serology
HSV-1/HSV-2 IgG — detects past infection between outbreaks; takes weeks to develop after first infection.
Serology for syphilis
RPR + TPHA run alongside — the dangerous ulcer mimic excluded routinely.
HSV-Specific Interpretation Nuances
- Type matters — genital HSV-1 recurs less than HSV-2; the type shapes prognosis.
- Location is not returned — serology detects past exposure, not the site; HSV-1 may be a childhood cold sore.
- Early serology lags — IgG takes 3–12 weeks; an early negative can be provisional.
- Low positives can be false — index values near the cutoff warrant confirmation.
After Diagnosis
A confirmed herpes diagnosis converts into strategy: first-episode treatment if that is the presentation; the episodic-vs-suppressive decision for established disease; transmission counseling; and the normalization conversation that is part of the diagnosis itself. The diagnosis is where management starts — delivered with the honest prognosis that most herpes improves substantially with time and treatment.
Diagnostic Services & Costs
| Service | What It Includes | Cost (NPR) |
|---|---|---|
| Consultation + examination | Clinical assessment. | Rs. 450 |
| Lesion PCR | Active-lesion confirmation with typing. | Rs. 5,000 – 8,000 |
| HSV serology | HSV-1/HSV-2 IgG. | Rs. 2,500 – 4,500 |
| Syphilis exclusion | RPR + TPHA alongside. | Rs. 1,500 – 3,000 |
| Interpretation | Results read in context. | Included |
Method matched to whether a lesion is present.
Why Our Diagnosis Is Trusted
- Differential-aware — the ulcer mimics actively excluded.
- Method-matched — PCR for lesions, serology between.
- Typing included — HSV-1 vs. HSV-2 distinguished.
- Syphilis excluded routinely — the dangerous lookalike never assumed away.
- Interpretation honest — the nuances a report cannot carry, explained.
- Immediate strategy — diagnosis converts to management same-visit.
Frequently Asked Questions
Can a doctor diagnose herpes by looking?
Often strongly suggest — characteristic grouped painful vesicles are recognizable — but lab confirmation is standard; the ulcer differential includes syphilis, which must never be assumed away.
How is it diagnosed without an active lesion?
Type-specific IgG serology — detecting past infection. It takes weeks to develop after first exposure and cannot locate the infection.
What else can genital ulcers be?
Syphilis, chancroid, trauma, fixed drug eruption, Behcet's, aphthae and more — the differential is why examination plus testing is the standard.
Why does the type matter?
Genital HSV-1 and HSV-2 differ in recurrence frequency and shedding — the type changes the prognosis and counseling.
What happens after diagnosis?
Strategy — first-episode treatment or the episodic-vs-suppressive decision, plus transmission counseling, all in the same visit.
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