Possible Causes of Penile Bumps and Changes in Semen Consistency - Urology

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The presence of bumps on the penile shaft and changes in semen consistency can be concerning and may indicate various underlying conditions. Based on your description, the bump is approximately 5mm in size, located at the junction of the shaft, and has shown signs of growth. Additionally, you mentioned that the semen has become less viscous and increased in volume. Here are some possible causes and considerations regarding your symptoms:
1. Pearly Penile Papules: These are small, benign bumps that can appear on the shaft of the penis. They are typically harmless and do not require treatment. However, if the bump is growing or changing, further evaluation is warranted.

2. Sebaceous Cysts: These are small lumps that can form under the skin due to blocked sebaceous glands. They are usually painless and can vary in size. If they become inflamed or infected, they may require treatment.

3. Folliculitis: This is an inflammation of the hair follicles, which can lead to small, red bumps on the skin. It can be caused by bacterial infections or irritation. If the bumps are painful or associated with other symptoms, it may require medical attention.

4. Genital Warts: Caused by the human papillomavirus (HPV), these can appear as small bumps or growths on the genital area. They can vary in appearance and may require treatment if they are bothersome or if there is a concern about transmission.

5. Penile Cancer: Although less common, any new growth or change in the skin of the penis should be evaluated by a healthcare provider to rule out malignancy, especially if there are changes in size, color, or associated symptoms.

6. Changes in Semen Consistency: The change in semen consistency can be influenced by various factors, including hydration levels, diet, frequency of ejaculation, and potential infections. Increased volume and decreased viscosity can sometimes be associated with infections or inflammation in the reproductive system.

7. Infections: Conditions such as prostatitis or sexually transmitted infections (STIs) can lead to changes in semen consistency and may also present with other symptoms such as pain, swelling, or discharge.
Given these possibilities, it is crucial to consult a healthcare provider for a thorough examination and appropriate diagnostic tests. They may perform a physical examination, and if necessary, order imaging studies or laboratory tests to determine the exact nature of the bump and any associated changes in semen.

In the meantime, avoid any self-diagnosis or treatment without professional guidance. It is also advisable to refrain from sexual activity until you have been evaluated to prevent potential transmission of infections. Keeping track of any additional symptoms, such as pain, itching, or changes in urination, can also provide valuable information for your healthcare provider.

In summary, while there are several benign conditions that could explain your symptoms, the growth of the bump and changes in semen consistency warrant a professional evaluation to rule out any serious conditions and to ensure appropriate management.