Originally Posted by speedythief
IIRC, you can't just drain it, the cartilige is curled in on itself. Normal people can get it treated right away but prolonged damage to the ears like these guys subject themselves to causes the deformity.
They're caused by tissue planes being torn and filling with blood. You can get them drained if you do it soon, but if you leave it it turns into scar tissue. Apparnetly, in fighting, they're are considered a badge of honour.