FWIW - it isn't entirely wrong, the wiki says: "Ringworm is a disease caused by infection of the skin by fungus, appearing as scaly, ring-shaped patches." then it goes on to describe it in Harry Potter
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> Ringworm is a disease caused by infection of the skin by fungus, appearing as scaly, ring-shaped patches. Fergus Fungal Budge was a wizarding product that was used to treat the ringworm disease on the foot. More at Harry Potter Wiki
