If there fluid in it? Does it fell as if something is inside of it. It could be a little blister, or it could be a cyst. It it becomes a doctor, a very simply and quick surgery could get rid of it.
Yeast won't cause bumps, but it could cause tearing. If you're using a good quality yeast cream it would normally diappear in 3-4 day. You don't need a urologist. Your GP or family physician should be able to diagnose and treat or refer you to a dermatologist.