Bursitis is the inflammation of a fluid-filled sack, individually called a Bursa, which covers the kneecap bone. The fluid in the Bursa provides a gliding surface, which reduces friction in tissues in the body. The Bursa is attached to the tendon connected to the kneecap decreasing friction in this area. As has been stated this is generally caused by kneeling for long periods of time. The inflammation can cause swelling, warmth and redness in the skin overlaying the knee. This could conceivably attribute to bruising on the skin. A more severe form of Bursitis exists known as Prepatellar Bursitis. This is when the Bursa fills with blood from an injury. If bacteria then gets into the Bursa fever can occur. Infection normally occurs from breaks in the overlying skin of the knee or from puncture wounds in the same area.
Bursitis can be treated by removing the Bursa fluid with a syringe. This procedure is known as Aspiration. This may be used in conjunction with an injection of cortisone to the swollen Bursa. Other treatments include ice compresses, anti-inflammatory and pain medications and rest. In the case of Prepatellar Bursitis analysis of the infected fluid may be necessary and then specific treatment using antibiotics is required.