What could cause numbness above my knee that I've had for 15 days?

Numbness above your knee for two weeks could be due to several different factors. One common cause is nerve injury or irritation, possibly related to meralgia paresthetica, where the lateral femoral cutaneous nerve is compressed or affected, typically causing numbness or tingling on the outer thigh. Alternatively, a nerve impingement possibly from lumbar spinal issues, such as a herniated disc, could also contribute to the numbness. Other possible causes might include localized trauma or injury, or even an underlying medical condition like diabetes which can affect nerve function. Consider whether you’ve had any recent changes in your physical activities, clothing (like tight belts), or any recent minor injuries. Right now, it’s crucial to be vigilant about any new symptoms, such as increasing numbness, weakness, or changes in bowel or bladder function, as these may indicate something more serious needing immediate attention. It might be helpful to see a healthcare professional for a full clinical evaluation, including a physical exam and possibly imaging studies or nerve conduction studies if a nerve issue is suspected. In the meantime, avoid positions that seem to worsen the numbness. Managing blood sugar levels is key if diabetes is a concern, and generally maintaining a healthy lifestyle with regular gentle exercise might aid in recovery. However, definitive diagnosis and personalized treatment plan should be determined by an evaluating healthcare provider.