It should be fungal otitis externa, and the white thing is a mold block. Don't use antibiotics, just use amoxicillin and dirithromycin, which will aggravate the chance of fungal infection. It is suggested to strengthen the cleaning of the external auditory canal, go to the hospital for washing and cleaning every 2-3 days, and locally drip fluconazole and boric acid alcohol to keep the external auditory canal clean (the interval between ear drops of the two drugs is 30 minutes). In addition, after each bath and shampoo, dry the water in the ear canal with a cotton swab, and don't pull out your ears hard.