It could also be a fungal infection, which is more common
in dogs with floppy ears. The ear fold keeps
in more moisture than
in pointed-eared dogs. It would be a good idea to have your vet take a look so you're not blindly throwing things at the problem that may not work, or may make the situation worse. It's also a good idea to occasionally check for, and remove, any ear wax that is visible. We swab ears with a Q-tip about once a month.