I noticed weird looking bumps on my bunny's ears. They are round like warts, on a stem slightly thinner than themselves, the same color as the skin, and about 3mm size. Any ides what they can be?
He's got two on the same ear, one bigger and one smaller.

Sounds like canker from ear mites or a bacterial infection, it's difficult to say without a photo. Best show him to a vet.