A diffuse, acute infection of the skin and subcutaneous tissues manifesting with pain, erythema, and swelling of the tissue. There is usually an associated trismus, inflammation of the cervical lymph nodes, and pyrexia. Cellulitis usually develops quickly over the course of hours and is a response usually to streptococcal organisms. Cellulitis can spread to the tissue spaces on both sides of the floor of the mouth (Ludwig's angina). Treatment involves removing the cause of the infection and providing drainage with additional use of antibiotics, aimed at the causative organism, where appropriate.