Single most likely diagnosis
- Chlamydia: This is one of the most common sexually transmitted infections (STIs), often asymptomatic in its early stages, making it a likely candidate due to its prevalence.
Other Likely diagnoses
- Gonorrhea: Similar to chlamydia, gonorrhea is a common STI that can be asymptomatic, especially in women, but can cause significant morbidity if untreated.
- Syphilis: With its various stages and potential for severe complications if left untreated, syphilis is an important consideration in the differential diagnosis of STIs.
- Herpes Simplex Virus (HSV): Given its prevalence and the fact that many infected individuals are unaware they have the virus, HSV is a plausible diagnosis.
Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- HIV: Human Immunodeficiency Virus infection is critical to diagnose early due to its significant impact on the immune system and the availability of effective antiretroviral therapy.
- Hepatitis B and C: These viral infections can be transmitted sexually and, if untreated, can lead to severe liver disease, making them crucial not to miss.
Rare diagnoses
- Lymphogranuloma Venereum (LGV): A less common STI caused by certain strains of chlamydia, LGV can cause significant morbidity, including proctitis and lymphadenopathy.
- Granuloma Inguinale: Also known as Donovanosis, this is a rare STI characterized by genital ulcers, more commonly seen in tropical regions.