Ringworm -------- Ringworm is a skin disease caused by a fungus similar to the one that causes athlete's foot in people. Young guinea pigs are usually more susceptible than adults. Ringworm in guinea pigs is generally characterized by patchy hair loss on the face, nose and ears. The skin in these areas may appear flaky. Areas of hair loss may extend along the top side of the trunk. A veterinarian must confirm the diagnosis and prescribe topical and/or oral medication. The medications to be used depend on the number of ringworm areas present and their distribution on the body. Ringworm can be transmitted from guinea pigs to people. It is, therefore, important to limit or restrict handling of infected guinea pigs (especially by young children) until their disease has been successfully treated. If handling is necessary, the handler should thoroughly wash his or her hands afterward.