If your teacher doesn't do this though, you can place a few drops of your favorite oil on a cotton ball before class and bring it with you. (health.com)
Or, the cleaner can be put on a cotton ball and used to wipe just the external ear canal. (petbusiness.com)
Put some fresh lemon or lime juice on a cotton ball and rub it on the dark skin patches. (fullhealthsecrets.com)