Perichondritis — It results from infection secondary to lacerations, haematoma or surgical incisions. It can result also from extension of infection from diffuse otitis externa or furuncle of the meatus. Pseudomonas and mixed flora are the common pathogens.
Initial symptoms are red, hot and painful pinna which feels stiff. Later abscess may form between the cartilage and perichondrium with necrosis of cartilage as the cartilage survives only on the blood supply from its perichondrium. Treatment, in early satges, consist of systematic antibiotics. When abscess has formed, it must be drained promptly and culture and sensitivity of the pus obtained. Incision is made in the natural fold and devitalized cartilage removed.