Differential Diagnosis for Erythematous Patch on the Glans Penis
- Single Most Likely Diagnosis
- Contact Dermatitis: This is a common condition that can occur due to irritation from soaps, condoms, or other products, leading to an erythematous patch on the glans penis. The glans penis is a sensitive area, and exposure to allergens or irritants can easily cause a reaction.
- Other Likely Diagnoses
- Balanitis: An inflammation of the glans penis, often caused by poor hygiene, infections (bacterial, fungal, or viral), or an allergic reaction. It presents with erythema, swelling, and sometimes discharge.
- Psoriasis: A chronic skin condition that can affect any part of the body, including the genital area. It may appear as an erythematous patch with silvery scales on the glans penis.
- Lichen Planus: An inflammatory condition that can affect the skin and mucous membranes, including the genital area. It may present with purplish, itchy, flat bumps on the glans penis.
- Do Not Miss Diagnoses
- Squamous Cell Carcinoma: Although rare, it is crucial not to miss this diagnosis. Squamous cell carcinoma of the penis can present with an erythematous patch or a lesion on the glans penis. Early detection is vital for effective treatment.
- Syphilis (Secondary): Secondary syphilis can cause a variety of skin rashes, including on the genital area. It's essential to consider syphilis in the differential diagnosis due to its potential for serious complications if left untreated.
- Rare Diagnoses
- Zoon's Balanitis: A rare condition characterized by a chronic, painless, erythematous plaque on the glans penis, often associated with a history of poor hygiene and smoking.
- Fixed Drug Eruption: A condition where certain medications cause a skin reaction, which can appear as an erythematous patch on the glans penis. This condition is rare but should be considered, especially if the patient has recently started new medications.
- Erythroplasia of Queyrat: A rare, premalignant condition that presents as a red, velvety plaque on the glans penis. It is essential to diagnose and treat this condition to prevent progression to squamous cell carcinoma.