Differential Diagnosis for Penis Itching
- Single most likely diagnosis
- Contact dermatitis: This is a common condition that can cause itching on the penis due to an allergic reaction or irritation from soaps, detergents, or other substances that come into contact with the skin.
- Other Likely diagnoses
- Jock itch (tinea cruris): A fungal infection that thrives in warm, moist areas, causing itching and a rash on the penis and surrounding areas.
- Scabies: A parasitic infection caused by the scabies mite, leading to intense itching, especially at night, and a pimple-like rash.
- Balanitis: Inflammation of the glans penis, often caused by poor hygiene, infection, or an allergic reaction, leading to itching, redness, and swelling.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Penile cancer: Although rare, penile cancer can present with itching, and early detection is crucial for effective treatment.
- Sexually transmitted infections (STIs): Certain STIs, such as herpes simplex virus or syphilis, can cause itching and other symptoms on the penis.
- Lichen planus: A chronic inflammatory condition that can affect the skin and mucous membranes, including the penis, causing itching and lesions.
- Rare diagnoses
- Psoriasis: A chronic autoimmune condition that can cause itching, redness, and scaly patches on the penis, although this is a less common location for the condition.
- Keratosis pilaris: A harmless condition that causes small, rough patches on the skin, which can sometimes occur on the penis and cause itching.
- Erythrasma: A bacterial infection that thrives in warm, moist areas, causing itching, redness, and a rash on the penis and surrounding areas.