Otitis Media (Inner Ear Infection)

No Antibiotics
1 out of 20 had less pain after 1-7 days
1 out of 9 developed diarrhea (average of 4 days)
No difference in complications or recurrence of infection (with or without antibiotics)
80% of all patients (with or without antibiotics) were completely better in 2-7 days

Reference: http://www.thennt.com/nnt/antibiotics-for-otitis-media/