Diagnosis: Primary syphilis (chancre)
A 32-year-old male presents with a solitary, painless, indurated genital sore that has been present for approximately three weeks. On examination, a firm, ulcerated lesion is noted on the glans penis, raising suspicion for a sexually transmitted infection. This case highlights the importance of recognizing primary lesions in the differential diagnosis of genital ulcers.
A 32-year-old male presents with a solitary, painless, indurated genital sore that has been present for approximately three weeks. The patient reports no associated symptoms such as fever or dysuria. On examination, a firm, ulcerated lesion is noted on the glans penis, measuring approximately 1.5 cm in diameter. There is no regional lymphadenopathy observed.Solitary lesion: A single ulcerated sore without multiple lesions.Painless: The lesion is not associated with pain or discomfort.Induration: There is significant firmness surrounding the ulcer.No associated symptoms: Absence of systemic symptoms such as fever or malaise.Location: The lesion is located on the glans penis.
The patient reports the onset of the sore approximately three weeks prior, following unprotected sexual intercourse with a new partner. He denies any prior history of similar lesions or sexually transmitted infections. There is no significant past medical history, and he does not take any medications. He is sexually active and has multiple partners, with inconsistent use of condoms.Onset: The sore developed approximately three weeks after unprotected intercourse.Prior treatments: No treatments have been attempted for the lesion.Sexual history: Engaged in unprotected sex with multiple partners.Past medical history: No significant medical conditions or previous STIs.Family history: Non-contributory.
Acute / First-Line ManagementBenzathine penicillin G: 2.4 million units IM as a single dose is the first-line treatment for primary syphilis.Doxycycline: 100 mg orally twice daily for 14 days can be used as an alternative for those allergic to penicillin.Patient education: Counseling on safe sex practices and the importance of notifying sexual partners.Workup and Diagnostic ConfirmationSerologic testing: RPR or VDRL followed by treponemal tests (e.g., FTA-ABS) for confirmation.Clinical monitoring: Follow-up to assess response to treatment and resolution of symptoms.Long-Term ManagementRegular follow-up: Patients should be monitored for treatment effectiveness and potential reinfection.Partner notification: Encourage patients to inform sexual partners for testing and treatment.Prevention: Education on safe sexual practices, including condom use.
Herpes Simplex Virus (HSV) Infection: Typically presents with painful vesicular lesions; serologic testing can help differentiate.Chancroid: Caused by Haemophilus ducreyi, presents as painful ulcers with purulent base; culture or PCR can confirm.Granuloma Inguinale: Characterized by painless ulcers with a beefy red appearance; requires culture for diagnosis (Donovan bodies).Behçet's Disease: Systemic condition that can cause genital ulcers; often associated with oral ulcers and ocular symptoms.Fixed Drug Eruption: May present as solitary lesions in the genital area; history of drug exposure is key.Squamous Cell Carcinoma: Rare but presents as a chronic non-healing ulcer; biopsy is necessary for diagnosis.Contact Dermatitis: May present with erosions in the genital area; history of irritant or allergen exposure is critical.Condylomata Acuminata: Caused by HPV, presents as warty lesions; can be differentiated by appearance and HPV testing.
High-Yield PearlsPrimary syphilis: Characterized by a solitary, indurated, painless ulcer known as a chancre, typically found on the genitalia.Diagnosis: Confirmed by serologic testing; RPR/VDRL followed by treponemal tests are essential for accurate diagnosis.Management: Benzathine penicillin G remains the first-line treatment; alternative options exist for penicillin-allergic patients.Education: Patient education on safe sexual practices is crucial in preventing reinfection and transmission.Follow-up: Regular follow-up is necessary to ensure treatment efficacy and to manage any potential complications.Recognizing the characteristics of primary syphilis is critical for effective diagnosis and treatment, as early intervention can significantly impact patient outcomes.
Tags: primary syphilis, chancre, STI