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Genital Sores

What is Genital Sores?

Genital sores are painful or painless lesions that develop on the external genital organs (penis, scrotum, vulva, vagina, clitoris, perianal area) or on the surrounding skin. They may appear as small red bumps, ulcerations, blisters, or crusted lesions and can range in size from a few millimeters to several centimeters. While some sores heal on their own, many are a sign of an underlying infection or medical condition that requires evaluation.

Common Causes

More than a dozen conditions can produce genital sores. Below are the most frequently encountered causes, grouped by type:

• Sexually Transmitted Infections (STIs)
  • Herpes simplex virus (HSV‑1 or HSV‑2) – “genital herpes”
  • Human papillomavirus (HPV) – warts that can ulcerate
  • Syphilis – primary chancre
  • Chancroid (Haemophilus ducreyi)
  • Lymphogranuloma venereum (Chlamydia trachomatis L1‑L3)
• Non‑STI infections
  • Granuloma inguinale (donovanosis) – caused by Klebsiella granulomatis
  • Fungal infections (candidiasis) – can cause erythematous, fissured patches that may bleed
  • Dermatophyte (ringworm) infection of the groin – ‘tinea cruris’
• Dermatologic & Autoimmune Conditions
  • Behçet’s disease – recurrent painful ulcerations
  • Psoriasis (inverse type) – can erode and form shallow sores
  • Fixed drug eruption – recurring lesions at the same site after a medication
• Trauma & Other Causes
  • Friction injuries from sexual activity or tight clothing
  • Skin cancers (squamous cell carcinoma, melanoma) that present as ulcerated nodules

Associated Symptoms

Genital sores seldom occur in isolation. The accompanying signs help clinicians narrow the differential diagnosis:

• Burning, tingling, or itching before the sore appears (classically with herpes)
• Fever, chills, headache, or malaise – especially with syphilis, chancroid, or systemic infections
• Swollen, tender inguinal lymph nodes (often unilateral with chancroid, bilateral with herpes)
• Discharge from the urethra or vagina
• Painful urination (dysuria) or difficulty passing stool
• Rash on the palms, soles, or trunk (suggestive of secondary syphilis)
• Oral or anal lesions concurrent with genital ulcers (possible herpes or HPV)
• Generalized skin changes (scaling, plaques) that point to psoriasis or eczema

When to See a Doctor

Because genital sores can signal infectious or serious systemic disease, prompt medical evaluation is recommended if you experience any of the following:

• New sores that do not begin to improve within 48–72 hours
• High‑grade fever (≥ 101 °F / 38.3 °C) accompanying the lesions
• Severe pain that interferes with walking, urination, or sexual activity
• Rapidly enlarging ulcer or one that bleeds profusely
• Multiple lesions appearing at the same time
• Recent unprotected sexual contact, especially with a new partner
• History of STIs, HIV, or immunosuppression
• Pregnancy – any genital lesion should be evaluated to protect mother and baby

Diagnosis

Healthcare providers use a step‑wise approach to identify the cause of genital sores:

1. Clinical History

• Onset, duration, and progression of the lesion(s)
• Associated symptoms (pain, discharge, systemic signs)
• Recent sexual activity, travel, or exposure to known partners with STIs
• Medication list (to rule out fixed‑drug eruptions)
• Immunization and vaccination status (e.g., HPV vaccine)

2. Physical Examination

• Inspection of the genital and perianal region
• Palpation of inguinal lymph nodes
• Examination of the oral cavity and skin for concurrent lesions

3. Laboratory Testing

• Polymerase chain reaction (PCR) or viral culture from lesion swabs – best for HSV and HPV
• Serologic tests for syphilis (RPR/VDRL + confirmatory treponemal assay)
• Gram stain and bacterial culture – indicated for chancroid or other bacterial ulcers
• NAAT (nucleic acid amplification test) for Chlamydia trachomatis and Neisseria gonorrhoeae
• Blood work (CBC, HIV test, CRP) if systemic infection is suspected

4. Biopsy

If the lesion does not heal, appears atypical, or malignancy is a concern, a skin biopsy is performed for histopathology.

Treatment Options

Treatment depends on the underlying cause. Below are the most common therapeutic pathways.

1. Antiviral Therapy

• Herpes simplex virus – oral acyclovir 400 mg 3×/day, valacyclovir 1 g 2×/day, or famciclovir 250 mg 3×/day for 7–10 days. Suppressive therapy (daily) is advised for frequent recurrences or for pregnant women.

2. Antibiotic Therapy

• Syphilis – Benzathine penicillin G 2.4 million units IM single dose (early disease). For late or neurosyphilis, longer regimens are required.
• Chancroid – Azithromycin 1 g single dose OR ceftriaxone 250 mg IM single dose plus doxycycline 100 mg bid for 7 days.
• Lymphogranuloma venereum – Doxycycline 100 mg bid for 21 days.
• Granuloma inguinale – Azithromycin 1 g weekly for 3 weeks OR doxycycline 100 mg bid for 30 days.

3. Topical Treatments

• Trifluridine 1% eye/skin ointment for localized HSV lesions (off‑label use).
• Imiquimod 5% cream for external genital warts caused by HPV.
• Topical antibiotics (mupirocin) for secondary bacterial infection of ulcerated lesions.

4. Management of Non‑Infectious Causes

• Behçet’s disease – systemic colchicine, corticosteroids, or biologics (e.g., infliximab) under specialist care.
• Psoriasis – topical steroids, vitamin D analogues, or systemic agents for severe disease.
• Fixed drug eruption – immediate discontinuation of the offending drug and supportive care.

5. Supportive & Home Care

• Keep the area clean with warm water; avoid harsh soaps.
• Apply a sterile, non‑adhesive dressing if the ulcer is open.
• Use over‑the‑counter pain relievers (acetaminophen or ibuprofen) as needed.
• Wear loose‑fitting cotton underwear to reduce friction.
• Avoid sexual activity until lesions have fully healed or until a healthcare provider confirms it is safe.

Prevention Tips

Many genital sores are sexually transmitted, so risk‑reduction strategies are essential:

• Consistently use latex or polyurethane condoms during vaginal, anal, and oral sex.
• Limit the number of sexual partners and maintain mutually monogamous relationships when possible.
• Get screened regularly for STIs—at least annually for sexually active adults; more often if you have new partners.
• Vaccinate:
  • HPV vaccine (recommended up to age 26 and now through age 45 for some individuals).
  • Hepatitis B vaccine if not already immune.
• Avoid sharing towels or razors that may be contaminated with infectious material.
• Practice good genital hygiene—gentle washing, drying, and avoidance of scented products that can irritate the skin.
• If you take medications known to cause fixed drug eruptions, discuss alternatives with your prescriber.

Emergency Warning Signs

Key Take‑aways

Genital sores can be a manifestation of a wide array of conditions, many of which are treatable if identified early. Prompt evaluation, appropriate laboratory testing, and targeted therapy are crucial for symptom relief, prevention of complications, and reduction of transmission to partners. If you notice any new or unusual lesions in the genital area, do not wait—schedule a medical visit promptly.

References

• Mayo Clinic. “Genital herpes.” https://www.mayoclinic.org
• CDC. “Syphilis – CDC Fact Sheet.” https://www.cdc.gov
• World Health Organization. “Guidelines for the treatment of sexually transmitted infections 2021.” https://www.who.int
• Cleveland Clinic. “Genital ulcers: Diagnosis & treatment.” https://my.clevelandclinic.org
• NIH – National Institute of Allergy and Infectious Diseases. “Herpes Simplex Virus.” https://www.niaid.nih.gov
• American College of Obstetricians and Gynecologists. “Screening for Sexually Transmitted Infections.” https://www.acog.org

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