||Repeated episodes of blunt trauma to the pinna, e.g. after boxing, rugby, football etc., which produce areas of subperichondrial separation or haemorrhage will cause necrosis and softening of the underlying auricular cartilage.
The fibrosis that develops during the healing of these damaged areas usually results in both thickening and deformity of the lateral surface of the pinna.
This type of post-traumatic deformity is called a cauliflower ear.
This patient was a boxer.