Hi! Ringworm is the most transmittable problem between all mammals. It is very likely that your piggy has got ringworm, too.
Please do NOT treat on spec with low dosed and inappropriate poducts. See a vet for appropriate treatment straight away.
Be aware that you are kind of wiping the crime scene if you dab just something on a spot for the sake of doing something - no vet will thank you for making their job much harder in diagnosing a problem! And in the end it is costing you more because you pay for the shop stuff and then will have to pay the vet for a more advanced case instead of treating correctly and getting on top of it promptly right away.
Take the time to carefully ready our hygiene advice and invest on a vet grade ringworm spore killing disinfectant like F10 to get on top of the ringworm spores you have been shedding and your piggy is now shedding. Follow the tips; they have all been learned the hard way; that is why they actually work to get rid of it once and forever!
Ringworm: Hygiene And Pictures