Cauliflower ear is
It is due to collection of blood between the auricular cailage and its perichondrium. If haematoma gets infected, severe perichondritis may set in. Often it is the result of blunt trauma seen in boxers, wrestlers and rugby players. Extravasated blood may clot and then organize, resulting in 'Cauliflower ear'. (Reference: Diseased of Ear, Nose and Throat, PL Dhingra,7th edition, pg no.52)
Keloid
Perichondritis in Boxers
Squamous cell carcinoma
Anaplastic cell carcinoma
Ear