[header] How to treat ringworm in guinea pigs [title] Recognize the symptoms. [step] Bald patches are the first and most obvious signs of ringworm. The fungus weakens the hair follicle, which then causes their fur to fall out. 
Bald patches will develop a crusty appearance with time and will eventually be accompanied by red patches around the eyes, ears, and nose. [title] Find a vet who can treat guinea pigs.