Why is it important to see a doctor promptly for prolonged ear discharge, especially if it is bloody or smells heavy?

　　In most cases, the perforation does not heal due to acute otitis media without reasonable treatment, which turns into chronic otitis media. In most cases, this disease does not cause serious problems other than hearing loss, but if there is bloody discharge or heavy odor, it may be a sign of other diseases. The presence of bloody discharge may be a sign of cancer or cholesteatoma, and heavy odor is a sign of cholesteatoma, both of which require timely surgery.