Why does your guinea pig have bold patches and cuts with puss coming out of it?

Dont take this as fact, but it could possibly be a form of scurvy, caused by a lack of vitimin C in your lil pigs diets. You could try providing a good source of it, such as through orange or red peppers (very high in vit c)...NOT water supplements as this tastes vile and stops the pigs drinkin water. But a definite vet trip is advised :) hope i could help