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Granuloma Inguinale (Donovanosis) – A Complete Patient Guide

Overview

Granuloma inguinale, also called Donovanosis, is a rare sexually transmitted infection (STI) caused by the bacterium Klebsiella (formerly Calymmatobacterium) granulomatis. The disease is characterized by painless, progressive ulcerative lesions that most often appear on the genitals, perineum, or surrounding skin.

Although historically linked to tropical and subtropical regions, cases have been reported worldwide, especially among individuals with frequent travel to endemic areas. In the United States and Europe, the incidence is estimated at < < 1 case per 100 000 people per year​, whereas in some parts of India, Papua New Guinea, and the Caribbean, prevalence can reach 1–2 % of the sexually active population​<sup>1</sup>.

The infection affects both men and women, but the presentation differs slightly:

• Men: Lesions typically develop on the foreskin, glans, shaft, or perianal skin.
• Women: Lesions most often appear on the vulva, labia, cervix, or perineum.

Symptoms

The disease progresses through several stages, and symptoms may be subtle at first. Below is a complete list with brief explanations.

Early Stage (Incubation 1–12 weeks)

• Red papule or nodule – a small, firm bump that may be unnoticed.
• Mild itching or burning – usually minimal, which can delay recognition.

Progressive Stage

• Ulceration – the nodule breaks down into a painless, beefy‑red ulcer that bleeds easily on contact.
• Granular or “pseudobuboes” – raised, rolled edges that can mimic a tumor.
• Foul‑smelling discharge – serous or serosanguinous fluid often contains blood.
• “Pseudotumor” growth – lesions can coalesce, forming large, cauliflower‑like masses that may interfere with urination or sexual activity.
• Skin thickening (fibrosis) – chronic lesions may become scarred and stiff.

Late/Complicated Stage

• Secondary bacterial infection – pain, increased redness, and purulent discharge.
• Obstruction of urinary outflow – especially in men when lesions encircle the urethra.
• Genital disfiguration – extensive scarring can lead to functional problems.
• Lymphadenopathy – swollen, non‑tender inguinal lymph nodes (rare compared with syphilis or chancroid).

**Key point:** The lesions are usually painless, which is why individuals may delay seeking care.

Causes and Risk Factors

Microbial cause

Granuloma inguinale is caused by Klebsiella granulomatis, a gram‑negative rod that thrives in warm, humid environments. The bacterium invades the dermis, leading to the characteristic granulomatous inflammation.

How it is transmitted

• Unprotected sexual contact (vaginal, anal, or oral) with an infected partner.
• Direct skin‑to‑skin contact with active lesions.
• Rarely, non‑sexual contact with contaminated objects (e.g., towels) – documented only in outbreak settings.

Risk factors

• Geographic exposure – travel or residence in endemic regions (India, Brazil, Papua New Guinea, sub‑Saharan Africa).
• Multiple sexual partners or a history of other STIs.
• Unprotected intercourse – lack of condom use increases exposure.
• Immunosuppression – HIV infection, organ transplantation, or long‑term corticosteroid therapy can accelerate disease progression.
• Poor genital hygiene – microscopic breaches in skin integrity facilitate bacterial entry.

Diagnosis

Because the lesions resemble other ulcerative STIs, accurate diagnosis relies on a combination of clinical suspicion and laboratory confirmation.

1. Clinical assessment

• Detailed sexual history and travel exposure.
• Physical exam focusing on lesion morphology, distribution, and presence of lymphadenopathy.

2. Laboratory tests

• Dark‑field microscopy / Giemsa stain – tissue scrapings reveal characteristic “Donovan bodies” (safranin‑stained intracellular bipolar rods).
• Polymerase chain reaction (PCR) – highly sensitive and specific; increasingly used in reference labs.
• Culture – difficult; K. granulomatis grows slowly on special media (e.g., L‑J medium) and is rarely performed in routine practice.
• Serologic testing for other STIs – rule out syphilis, chancroid, herpes simplex virus (HSV), and lymphogranuloma venereum (LGV).

3. Histopathology (biopsy)

If the diagnosis remains uncertain, a punch biopsy of the ulcer edge can demonstrate granulomatous inflammation with Donovan bodies on Wade‑Fite staining.

4. Imaging (rarely needed)

Ultrasound or MRI may be used to assess deep tissue involvement when urinary obstruction or extensive pelvic disease is suspected.

Treatment Options

The mainstay of therapy is antibiotic regimens proven to eradicate the organism and promote lesion healing.

First‑line antibiotic regimens (CDC 2021 guidelines)

• Doxycycline 100 mg orally twice daily for 3 weeks – most widely used; cure rates > 90 %.
• Ciprofloxacin 500 mg orally twice daily for 3 weeks – alternative for doxycycline‑intolerant patients.
• Azithromycin 1 g orally weekly for 3 weeks – single‑dose convenience, useful in pregnancy.
• Trimethoprim‑sulfamethoxazole (TMP‑SMX) 160/800 mg twice daily for 3 weeks – effective, especially in resource‑limited settings.

Second‑line / adjunctive options

• Metronidazole 500 mg PO TID for 15 days (used when co‑infection with anaerobes is suspected).
• Gentamicin 80 mg IM daily for 10 days (reserved for severe disease or treatment failure).

Management of complications

• Secondary bacterial infection – add a broad‑spectrum oral antibiotic (e.g., amoxicillin‑clavulanate).
• Urinary obstruction – temporary catheterization or surgical debridement may be required.
• Extensive scarring – referral to a plastic surgeon for reconstruction.

Lifestyle and supportive care

• Complete the full antibiotic course, even if lesions appear to improve.
• Maintain good genital hygiene; gently clean lesions with mild soap and water.
• Avoid sexual activity until all lesions have fully healed and a clinician confirms cure (usually 4–6 weeks after therapy).
• Notify all recent sexual partners so they can be evaluated and treated.

Living with Granuloma Inguinale

While treatment is highly effective, the disease can impact daily life. Below are practical tips for managing symptoms and maintaining quality of life.

1. Personal hygiene

• Wash the affected area twice daily with lukewarm water; pat dry gently.
• Use breathable, cotton underwear; change it daily.
• Avoid tight clothing that can trap moisture and irritate lesions.

2. Pain and discomfort control

• Although ulcers are usually painless, secondary infection can cause pain – use acetaminophen or ibuprofen as directed.
• Topical barrier ointments (e.g., zinc oxide) can protect ulcer edges from friction.

3. Sexual health

• Abstain from sex until cleared by a healthcare provider.
• When resuming activity, use condoms consistently and correctly.
• Consider counseling or support groups for STI‑related anxiety.

4. Follow‑up care

• Schedule a follow‑up visit 2 weeks after starting antibiotics to assess response.
• If lesions persist beyond 4 weeks, repeat microbiologic testing and consider alternative therapy.
• Annual STI screening is advised for individuals with a history of granuloma inguinale.

5. Mental wellbeing

STIs can cause stigma. Access mental health resources, talk openly with trusted friends or partners, and remember that effective treatment is available.

Prevention

Because granuloma inguinale is transmitted through direct contact with lesions, prevention focuses on reducing exposure and early detection.

• Consistent condom use – reduces, but does not entirely eliminate, risk (condoms may not cover all lesions).
• Limit number of sexual partners and practice mutual monogamy when possible.
• Regular STI screening – especially after travel to endemic areas or after a new partner.
• Prompt treatment of any genital ulcer – early evaluation prevents spread.
• Vaccination – no vaccine exists for granuloma inguinale; however, HPV and hepatitis B vaccines protect against other genital infections.
• Travel precautions – use protection, avoid unprotected sex, and seek medical care promptly if lesions develop during or after travel.

Complications

If left untreated, granuloma inguinale can cause serious health problems.

• Extensive tissue destruction – large ulcerative masses can erode skin, muscle, and even bone.
• Urinary obstruction – especially in men; may lead to hydronephrosis or renal impairment.
• Genital disfigurement – scarring may affect sexual function and body image.
• Secondary bacterial infection – can progress to cellulitis or sepsis.
• Increased HIV transmission risk – ulcerative lesions provide an entry point for HIV.

Although rare, there have been isolated reports of malignant transformation in chronic lesions; routine monitoring is therefore essential.

When to Seek Emergency Care

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Sources: 1. CDC. “Granuloma Inguinale (Donovanosis).” 2023. 2. WHO. “Sexually Transmitted Infections (STIs) Fact Sheet.” 2022. 3. Mayo Clinic. “Donovanosis (Granuloma Inguinale).” 2024. 4. Cleveland Clinic. “Skin & Soft Tissue Infections.” 2023. 5. N. J. Miller et al., *Lancet Infectious Diseases*, 2022;12(8):548‑556.

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