Football injury. clashing of knees. mine is situated on the inner side of knee. been about 10days pain increasing daily?

Doctor Visit: Pain should not be increasing over time. Are you on crutches? How are you walking around? May need to rest the knee. Likely a meniscus tear or MCL sprain. See a doctor for exam and follow up to stop pain and prevent further knee damage.

Get examined: Many possibilities including simple bruise to the more annoying bursitis to the more significant ligament or cartilage problems. A doctor examination will be needed here and if remains unclear your doctor may need to consider tests such as xrays and scans