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As your friend is infected with contaminated water and noticed blood, there is chance of infection to persist if untreated at earlies
Keep the Ear Dry (Do not use cotton swab much as infection can spread thru inner structures)
Look for any foreign particle left insitu and if there is discharge from that ear,
Instill Ciplox ear drop
6th hourly in affected ear .
twice a day
Tab levoflox orally twice a day for 5 days
I Hope I Provided Useful Information. Do ask Furthur Questions to help You get well soon.
Dr.J.Kingson John David