Arthritis, which is called purulent, is nothing more than an infection in the body. Arthritis can be caused by bacteria, viruses or fungi, and can occur when the immune system is unable to fight off an infection. The infection can enter the joints through the bloodstream or through direct contact. Symptoms of inflammatory arthritis may include pain, swelling, redness and fever. Treatment for suppurative arthritis includes antibiotic therapy, pain relief, and rest for the joint. It is important to see a doctor if these symptoms occur.