It is never a good idea to ignore a bad smell coming from you ear canals. The smell is usually indicative of some sort of infection, and in this case you might have infection in your ear canals which can cause itciness and bad odour. Sometimes bath or shower water can get lodged in the canal behind some earwax and cause an infection.
If possible go see a GP soon, you will need a proper examination and the right medicine to get rid of this problem.
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