guinea pig growth

Question
My guinea pig has a large white growth coming out of her ear. What is it? She is acting normal and doesn't seem to have any pain.

Answer
It may very well be a sebaceous cyst, which is a benign cyst caused by a plugged oil gland.

Having said that I can't make an educated guess without a picture. Is it possible you can take a picture of it and send to me. You can attach it to your question. It's the most valuable means of identifying what you are seeing.  

If that's what it is we can discuss the options with a little more authority. So please, do your best to send me a photo.