<prompt> Phlegmon; all are true exceptThe tissue is tender, painful and hard to touch.Pain, fever, malaise are aggressive.It is rapidly spreading infection of subcutaneous tissue due to micro-organism like staphylococci.Is caused due to micro-organism which are capable to produce hyaluronidase which breakdown intercellular cementing substance hyaluronic acid.  <response>: Cellulitis Phlegmon Diffuse swelling of face with no defined margins. The tissue are tender, painful, hard to touch. Pain, fever, malaise, exhaustion, all features are more aggressive. It takes 3-7 days to develop. Spreading factor of Duran and Reynals. Rapidly spreading infection of subcutaneous tissue due to micro-organism which are capable to produce hyaluronidase which breakdown intercellular cementing substance hyaluronic acid. Streptococci is more involved in causing cellulitis than staphylococci. Streptocci produce enzymes such as : Streptokinase fibrinolysin, hyaluronidase, and streptodornase. These enzymes breakdown fibrin and connective tissue ground substance and lyse cellular debris. Thus facilitate rapid spread of bacteria along the tissue planes. 