Had perforated ear drum 3 months ago, now swimmers ear and a little blood, not swimming and keeping ear dry, how did i get swimmers ear?

Common: Swimmers &prolonged head baths may commonly develop otitis externa (swimmers ears). Skin of ear canal gets irritated with constant moisture &skin bacteria in external ear canal ( staph or strept ) start a skin infection which can be VERY painful. Fungi may be involved as well. White vinegar: rubbing alcohol (70%) mixture1:1 drops in ear post swimming/baths may prevent if used regularly.Consult ENT