What can I put on my guinea pig that has sores around ear and mouth?

It is important not to self-medicate your pet. There are several potential underlying medical causes for sores on your guinea pig's face. Some causes may be relatively minor, while others can be very serious. Without understanding the underlying cause, applying improper treatments can be dangerous for your pet. Contacting your exotic veterinarian is the best course of action for your guinea pig's health. They can properly diagnose and treat the cause of your guinea pigs' sores.