It is called 'cauliflower ear' and some MMA fighters wear them like a badge of honour.
Here is some context
Cauliflower ear is an irreversible condition that occurs when the external portion of the ear is hit and develops a blood clot or other collection of fluid under the perichondrium. This separates the cartilage from the overlying perichondrium that supplies its nutrients, causing it to die and resulting in the formation of fibrous tissue in the overlying skin. As a result, the outer ear becomes permanently swollen and deformed, resembling a cauliflower.
Here are some more YouTube videos explaining the condition
Here are some more YouTube videos showing cauliflower ear drainage.
Remember people, never pick a fight with someone that has cauliflower ears.