Bumps on the Knee: Causes and When to Seek Help - Family Medicine

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When it comes to bumps on the knee, particularly those that resemble mosquito bites, it’s important to consider several potential causes. The characteristics you've described—smooth, non-painful, and sometimes fluctuating in size—can point to a few different conditions. Here’s a breakdown of what these bumps might be and when you should seek medical attention.


Possible Causes of Bumps on the Knee
1. Lipomas: These are benign tumors made of fat tissue. They are usually soft, movable, and painless. Lipomas can occur anywhere on the body, including the knee, and they often do not require treatment unless they become bothersome.

2. Cysts: A common type of cyst that can occur near the knee is a Baker's cyst, which is a fluid-filled sac that can develop behind the knee. However, if the bumps are on the front or sides of the knee, they might be sebaceous cysts, which are also benign and form when hair follicles become clogged.

3. Dermatological Conditions: Conditions like hives (urticaria) or other allergic reactions can cause raised bumps on the skin. These may come and go and can be triggered by various factors, including food, medications, or environmental allergens.

4. Folliculitis: This is an inflammation of hair follicles that can result in small, red bumps. It can be caused by bacterial or fungal infections and may be itchy or tender, although it can also be painless.

5. Infections: While you mentioned that the bumps are not painful or itchy, it’s still worth considering that some infections can present with bumps that may not initially cause discomfort.
6. Other Conditions: Conditions like psoriasis or eczema can also lead to raised areas on the skin, although these typically come with other symptoms like itching or scaling.


When to Seek Medical Help
Given that the bumps are not painful or itchy, it may not be urgent to seek immediate medical attention. However, you should consider consulting a healthcare professional if:
- The bumps change in appearance, size, or color.

- New bumps continue to appear.

- You develop additional symptoms, such as pain, swelling, redness, or fever.

- You have concerns about the cosmetic appearance or if the bumps become bothersome.


Which Specialist to See
For skin-related issues, including bumps on the knee, a dermatologist is typically the best specialist to consult. They can perform a thorough examination and may conduct tests, such as a biopsy, if necessary, to determine the exact nature of the bumps. If the bumps are suspected to be related to an underlying joint issue, an orthopedic specialist may also be appropriate.


Conclusion
In summary, while the bumps on your knee may not currently be a cause for concern, monitoring their behavior and consulting with a dermatologist can provide clarity and peace of mind. It’s always better to err on the side of caution when it comes to changes in your skin or health. If you notice any significant changes or develop new symptoms, don’t hesitate to seek medical advice.