Differential Diagnosis for Fluid Filled Cyst on Underside of Penis Head
- Single most likely diagnosis
- Pearly Penile Papule: A benign condition characterized by small, fluid-filled cysts or papules on the penis, often found on the corona or underside of the penis head. This condition is common and usually requires no treatment.
- Other Likely diagnoses
- Epidermoid Cyst: A benign cyst that can occur on the penis, filled with a cheesy material or fluid, often resulting from a blocked oil gland. These cysts are generally harmless but may become inflamed or infected.
- Fordyce Spots: Small, yellowish or white bumps on the penis that can sometimes appear as fluid-filled cysts, caused by ectopic sebaceous glands. They are benign and typically do not require treatment.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Penile Cancer: Although rare, any unusual growth or lesion on the penis should be evaluated for the possibility of cancer. Early detection is crucial for effective treatment.
- Genital Herpes: Caused by the herpes simplex virus, this condition can lead to painful blisters or sores that might initially be mistaken for fluid-filled cysts. It's a significant diagnosis due to its infectious nature and potential for complications.
- Rare diagnoses
- Urethral Diverticulum: An outpouching of the urethral wall that can present as a fluid-filled cyst, more commonly found in women but can occur in men. It may cause symptoms like urinary incontinence or recurrent infections.
- Müllerian Duct Cyst: A rare congenital anomaly that can present as a cystic structure on the penis, resulting from remnants of the Müllerian ducts. These cysts are usually benign but can become infected or cause urinary symptoms.