Parasites :Fleas, mites, lice, and ticks can make them scratch and lick, too, causing bald spots on dog or cat and even sores.
Treatment is usually quick and easy.
Ask your vet which medicine you should use.
Ring worm infection : No, it’s not a worm.
It’s a fungal infection.
And a scaly ring of missing hair is a sign.
Your vet can tell you for sure and prescribe antifungal creams for dogs or cats or ointments, medicated baths, or even oral meds..