The most common cause of<unk>  is blunt trauma to the<unk>  leading to a hematoma which, if left untreated, eventually heals to give the distinct appearance of<unk> . The structure of the<unk>  is supported by a cartilaginous scaffold consisting of the following distinct components: the helix, antihelix, concha, tragus, and antitragus. The skin that covers this cartilage is extremely thin with virtually no subcutaneous fat while also strongly attached to the perichondrium, which is richly vascularized to supply the avascular cartilage.<unk>  can also present in the setting of nontraumatic inflammatory injury of auricular connective tissue such as in relapsing polychondritis (RP), a rare rheumatologic disorder in which recurrent episodes of inflammation result in destruction of cartilage of the<unk> s and nose. Joints, eyes, audiovestibular system, cardiovascular system, and respiratory tract can also be involved.
Cauliflower ear
Hemotympanum
Philinus of Cos
Fibrous papule of the nose
Syrinx 
Lacrimal groove
Ayer's Sarsaparilla
Orbital septum