Differential Diagnosis for Penile Itching after Oral Sex without Blisters
- Single Most Likely Diagnosis
- Phthirus pubis (Pubic Lice): This condition is highly contagious and can be spread through sexual contact, including oral sex. Itching is a common symptom, and the absence of blisters does not rule out this diagnosis.
- Other Likely Diagnoses
- Tinea cruris (Jock Itch): A fungal infection that can cause itching in the genital area. It's possible to contract this through skin-to-skin contact or contaminated objects.
- Contact Dermatitis: An allergic reaction or irritation from a substance that came into contact with the penis during oral sex, such as certain soaps, lubricants, or even components of a partner's saliva or genital secretions.
- Urethritis: Inflammation of the urethra, often caused by bacterial or viral infections, which can lead to itching and discomfort. It can be transmitted through sexual contact.
- Do Not Miss Diagnoses
- Primary Syphilis: Although less common, syphilis can present with a variety of symptoms, including itching, and it's crucial to diagnose early due to its potential for serious complications if left untreated.
- HIV: Human Immunodeficiency Virus can cause a range of symptoms, including skin rashes or itching, especially during the acute phase of infection. Early diagnosis is critical for effective management.
- Rare Diagnoses
- Scabies: While more commonly associated with burrows and blisters, scabies can occasionally present with intense itching without the typical skin findings, especially in the early stages or in immunocompromised individuals.
- Erythrasma: A bacterial infection that can cause itching and redness in the groin area, though it's less commonly associated directly with oral sex.
- Lichen planus: An autoimmune condition that can affect the skin and mucous membranes, leading to itching and lesions. It's rare but could be considered in the differential diagnosis if other causes are ruled out.