Differential Diagnosis for Tinea Types of Rash on Penis
- Single most likely diagnosis
- Tinea cruris (jock itch): This is the most likely diagnosis due to the location of the rash on the penis, which is a common area affected by tinea cruris. The rash is typically itchy, red, and circular.
- Other Likely diagnoses
- Candidiasis: This fungal infection can cause a red, itchy rash on the penis, especially in uncircumcised men or those with diabetes. It's often accompanied by a white discharge.
- Contact dermatitis: Irritation from soaps, lotions, or other products can cause a rash on the penis, which may resemble tinea.
- Psoriasis: Although less common on the penis, psoriasis can cause red, scaly patches that may be mistaken for a tinea infection.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Syphilis: The secondary stage of syphilis can cause a rash on the penis, which may be mistaken for tinea. It's crucial to consider syphilis due to its serious complications if left untreated.
- Herpes simplex virus (HSV): HSV can cause painful blisters or sores on the penis, which may be confused with a tinea infection. Prompt diagnosis and treatment are essential to prevent complications.
- Rare diagnoses
- Tinea corporis (ringworm): Although more common on other parts of the body, tinea corporis can occasionally affect the penis, causing a circular, itchy rash.
- Histoplasmosis: This rare fungal infection can cause a rash on the penis, especially in immunocompromised individuals. It's often accompanied by systemic symptoms like fever and fatigue.