Chancre

Chancre: The Primary Symptom of Syphilis

A chancre is a painless ulcerative sore that is one of the earliest signs of syphilis, a sexually transmitted infection caused by the bacterium Treponema pallidum. Typically developing at the site of infection, chancres are characterized by their thick, rubbery base and well-defined edges, often appearing on the genitals, anus, or mouth. The presence of a chancre is a hallmark of the primary stage of syphilis and necessitates prompt medical evaluation and treatment.

Extragenital syphilitic chancre of the left index finger PHIL 4147 lores

Introduction

Syphilis is a multi-stage, sexually transmitted disease that can cause serious health problems if left untreated. The development of a chancre is the first sign of infection, usually occurring within 3 weeks of exposure. Although primarily associated with sexual contact, syphilis can also be transmitted from mother to child during pregnancy, known as congenital syphilis.

A typical chancre seen in primary syphilis.

Causes

Syphilis is caused by the bacterium Treponema pallidum. Transmission primarily occurs through direct contact with a syphilitic sore during vaginal, anal, or oral sex. Less commonly, the infection can be spread through shared needles or blood transfusions, and from an infected mother to her baby during pregnancy or childbirth.

Characteristics of Chancre

• Appearance: Chancres are usually small, round, firm, and painless ulcers.
• Location: They often appear at the site of infection, commonly on the genitals, anus, or mouth, but can also occur on the fingers or other parts of the body.
• Duration: Without treatment, a chancre will typically heal on its own within 3 to 6 weeks. However, the underlying syphilis infection remains and progresses to the secondary stage if not treated.

Diagnosis

The diagnosis of syphilis, including chancre identification, involves:

• Physical examination of the sore
• Blood tests to detect syphilis antibodies
• Darkfield microscopy to directly observe Treponema pallidum bacteria

Treatment

Early-stage syphilis, including chancres, is effectively treated with penicillin or other appropriate antibiotics. Treatment kills the bacteria causing the infection, preventing further progression of the disease. It's crucial for sexual partners to be tested and treated if necessary to prevent reinfection.

Prevention

Prevention of syphilis and chancre formation includes:

• Practicing safe sex, using condoms and dental dams
• Regular STD screening for sexually active individuals
• Avoiding sexual contact with infected individuals until they have completed treatment

See Also

• Syphilis
• Sexually transmitted infection
• Treponema pallidum
• Antibiotics

External Links

• Centers for Disease Control and Prevention - Syphilis (STD Fact Sheet)
• World Health Organization - Syphilis

References

• "Syphilis: Epidemiology, Pathophysiology, and Clinical Manifestations." Journal of Clinical Pathology.
• "Management of Syphilis in the Adult Patient." Infectious Disease Clinics of North America.

Chancre Resources
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