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DR10.7 | Inguinal Bubo Syndromic Management — SDL Guide (Part 2)

Differential Diagnosis and Investigations

Three-panel medical diagram showing inguinal lymph node anatomy, differential diagnosis of inguinal swelling in sexually transmitted diseases, and key investigation and syndromic management steps. — **Panel A:** Anterior pelvis and upper thigh overview with superficial inguinal lymph node chains, enlarged inguinal bubo, genital ulcer site, lymphatic drainage arrows, and labels for genital skin drainage to inguinal nodes.. **Panel B:** Differential diagnosis icons for LGV, donovanosis, chancroid, primary syphilis, pyogenic adenitis from lower-limb infection, bubonic plague in endemic settings, and lymphoma with systemic features.. **Panel C:** Investigation and management workflow showing tissue crush smear with Giemsa for Donovan bodies, LGV serology by complement-fixation titre or microimmunofluorescence, NAAT where available, syndromic treatment at first contact, sample collection, partner management, and HIV testing..

Because several conditions produce inguinal swelling, a disciplined differential prevents both over- and under-treatment. Beyond LGV and donovanosis, consider chancroid (painful suppurative bubo with a preceding painful ulcer), primary syphilis (firm non-tender nodes with a painless chancre), pyogenic adenitis from a lower-limb infection, bubonic plague in endemic settings, and lymphoma when systemic features are present. Investigation strategy is shaped by the resource setting: a tissue crush smear stained with Giemsa for Donovan bodies is the most accessible confirmatory test for donovanosis at the point of care. LGV is confirmed serologically (complement-fixation titre, classically high, or microimmunofluorescence) or by nucleic-acid amplification testing where available, but these are often unavailable in primary care. The operating principle of syndromic management is therefore to treat at first contact based on the clinical picture rather than waiting for confirmation, while sending available samples and offering HIV testing.

A medical comparison infographic contrasts LGV, donovanosis, chancroid, primary syphilis, and pyogenic infection as causes of inguinal lymphadenopathy, with a caution to aspirate fluctuant buboes rather than incise them. — **Panel A:** Anterior lower abdomen and groin locator showing inguinal lymph nodes, enlarged tender bubo, genital ulcer region, and drainage pathway from genital lesion to inguinal nodes.. **Panel B:** Comparison table with columns for LGV, Donovanosis, Chancroid, Primary syphilis, and Pyogenic infection; rows for causative organism, bubo characteristics, associated genital lesion, diagnostic test, and treatment approach.. **Panel C:** Clinical procedure caution showing correct needle aspiration through adjacent healthy skin versus incorrect wide incision and drainage; labels include fluctuant bubo, intact healthy skin, aspiration needle, pus collection, and chronic non-healing sinus risk..

Investigation pointers:
- Donovanosis: tissue crush smear (Giemsa) for Donovan bodies — point-of-care
- LGV: serology (complement fixation/microimmunofluorescence) or NAAT where available
- Syndromic principle: treat at first contact, do not await confirmation; offer HIV testing

SELF-CHECK

On examining a fluctuant inguinal bubo, what is the correct procedural step, and why?

A. Incise and drain widely to evacuate all the pus, as for any abscess

B. Aspirate the pus through intact adjacent healthy skin, because incision risks chronic non-healing sinuses

C. Leave it strictly alone and never touch it under any circumstance

D. Apply a tight pressure bandage to force spontaneous resolution

Reveal Answer

Answer: B. Aspirate the pus through intact adjacent healthy skin, because incision risks chronic non-healing sinuses

A fluctuant bubo should be aspirated (through adjacent healthy skin), not incised. Incision and drainage of a bubo tends to produce chronic, non-healing sinuses and delays recovery. Aspiration relieves the collection while avoiding that complication. Definitive treatment is the appropriate antibiotic regimen alongside aspiration as needed.

Syndromic Management With NACO Kit 6

Medical infographic showing NACO Kit 6 yellow syndromic management of inguinal bubo with aspiration guidance, drug comparison, partner care, HIV testing, follow-up, and referral criteria. — **Panel A:** Anterior pelvis and inguinal region showing inguinal bubo, genital ulcer association, NACO Kit 6 yellow box, needle aspiration of fluctuant bubo, and crossed-out incision/scalpel warning.. **Panel B:** Comparison of LGV and donovanosis indications with first-line doxycycline, treatment duration, erythromycin alternative, and azithromycin option for donovanosis.. **Panel C:** Syndromic public-health package showing partner treatment, condom provision, HIV testing, adherence counselling, follow-up, and referral criteria..

Syndromic management of the inguinal bubo means treating the syndrome reliably at first contact, and under the NACO programme this corresponds to Kit 6 (yellow) — per current NACO guidance, with the exact drugs and durations to be confirmed against the latest national protocol. The mainstay drug is doxycycline 100 mg twice daily, given for at least 21 days in LGV and continued for donovanosis until the lesions have fully healed (often three weeks or longer); erythromycin is the standard alternative where doxycycline is contraindicated (for example in pregnancy), and azithromycin (1 g weekly) is an accepted alternative specifically for donovanosis. A fluctuant bubo is aspirated, never incised, to avoid chronic sinus formation. Beyond drugs, syndromic management is incomplete without the public-health package: treat the sexual partner(s), promote and provide condoms, offer HIV testing, counsel on completing the full course, and arrange follow-up. Refer patients with proctocolitis, extensive or destructive disease, treatment failure, or HIV co-infection.

Infographic summarizing NACO Kit 6 yellow syndromic management for inguinal bubo, including indications, doxycycline-based treatment, partner care, counselling, aspiration, follow-up, and referral criteria. — **Panel A:** Clinical inguinal bubo, genital ulcer icon, NACO Kit 6 yellow box, fluctuant bubo aspiration, crossed-out incision/scalpel warning.. **Panel B:** Comparison table showing indication, first-line drugs, duration, partner management, and referral criteria for LGV and donovanosis under inguinal bubo syndromic management.. **Panel C:** Counselling and follow-up sequence: STI/RTI counselling, treatment adherence, condoms, HIV testing or ICTC referral, follow-up, and referral if complicated or not improving..

Management essentials:
- NACO Kit 6 (yellow); first-line doxycycline 100 mg BD (LGV ≥21 days; donovanosis until healed)
- Erythromycin alternative (e.g. pregnancy); azithromycin 1 g weekly an alternative for donovanosis
- Aspirate — do not incise — a fluctuant bubo
- Treat partner(s), provide condoms, offer HIV testing, counsel, follow up, refer when complicated

SELF-CHECK

A 30-year-old man has a beefy-red, friable genital ulcer that bleeds on touch and is painless, with a subcutaneous groin swelling. A tissue crush smear shows intracellular organisms within macrophages. What is the diagnosis and a key management principle?

A. LGV — give a single dose of azithromycin and discharge

B. Donovanosis — Donovan bodies confirm it; treat with prolonged doxycycline until lesions heal, treat the partner, and offer HIV testing

C. Chancroid — incise the pseudobubo immediately

D. Primary syphilis — a single dose of benzathine penicillin is curative and no follow-up is needed

Reveal Answer

Answer: B. Donovanosis — Donovan bodies confirm it; treat with prolonged doxycycline until lesions heal, treat the partner, and offer HIV testing

A beefy-red friable ulcer with a pseudobubo and intracellular Donovan bodies on tissue smear is donovanosis (Klebsiella granulomatis). Treatment is prolonged doxycycline (continued until lesions heal; azithromycin weekly is an alternative), with partner treatment and HIV testing as part of syndromic care. A pseudobubo is not incised.

Self-Assessment: Inguinal Bubo Recognition and Management

A four-panel medical diagram compares LGV bubo and donovanosis pseudobubo, shows Donovan bodies on smear, and summarizes aspiration-based management and public-health steps. — **Panel A:** Anterior groin view showing inguinal ligament, inguinal lymph nodes, femoral lymph nodes, enlarged LGV bubo, and groove sign depression.. **Panel B:** Comparison of true LGV lymph-node bubo versus donovanosis subcutaneous pseudobubo.. **Panel C:** Point-of-care smear showing macrophage with Donovan bodies confirming donovanosis.. **Panel D:** Management flow showing fluctuant bubo aspiration, avoided incision and drainage, doxycycline Kit 6 note, partner management, condoms, HIV testing, and follow-up..

Test your own grasp of this syndrome before moving on, because the value of recognising an inguinal bubo lies entirely in pairing the right diagnosis with the right action. Work through the questions below as if a patient were in front of you, articulating not just the answer but the reasoning — which organism, which sign, which kit, and which procedural rule. Pay particular attention to the two traps that catch learners most often: confusing the LGV groove sign with the donovanosis pseudobubo, and reflexively incising a fluctuant bubo that should be aspirated. If any item feels uncertain, return to the relevant section and rehearse the distinction until it is automatic, because under clinical pressure you will default to whatever you have practised most thoroughly. Treat each gap as a cue for focused revision rather than a verdict on your ability.

Self-check questions:
- What is the groove sign, and which condition does it indicate?
- How do the bubo of LGV and the pseudobubo of donovanosis differ?
- What confirms donovanosis at the point of care?
- What is the first-line Kit 6 drug, and how long is it given in LGV versus donovanosis?
- Why is a fluctuant bubo aspirated rather than incised?
- What public-health steps complete syndromic management (partner, condoms, HIV testing, follow-up)?

CLINICAL PEARL

The groove sign is memorable but not universal — it appears in only a minority of LGV cases, so its absence never rules LGV out. Conversely, the 'bubo' of donovanosis is usually a pseudobubo (subcutaneous granuloma), not a true lymph node, which is why a tissue smear for Donovan bodies — not a node biopsy — is your point-of-care confirmatory test. And whichever you treat, remember the deceptively simple rule that distinguishes good from harmful care: aspirate a fluctuant bubo, never incise it, because incision converts a treatable swelling into a chronic discharging sinus.