Hello, I've got 3 guinea pigs. one of them has a few strange red wounds on its back. i'm not completely sure what they are, i've had my guinea pigs for nearly a year now. i've seen a few biting on the guinea pig i own. (the one in the photo) as they used to fight over their food. but now i've recently seen some red wounds on the guinea pig in the photo. i don't know what they are, and i really am eager to know. i've heard it could be fungus infection but i want to make sure it is. it would be great if anyone can help me with what the wound is, the cause of the wound and anyway to get treat the wounds.