The cause of ringworm is a fungus that eats keratin.
The fungus that causes ringworm is called dermatophytes.
The dermatophytes is a pathogenic fungus that grows on your skin, mucous membranes, hair, nails as well as feathers, and other body surfaces, causing ringworm and related diseases.
Ringworm is also able to affect birds and other animals and not just humans.
To get rid of ringworm you need a fungal cream from the doctor through a prescription to kill the fungus and fully get rid of ringworm.
You can also apply some apple cider vinegar to the fungus that is causing the ringworm and make sure to keep the area where the ringworm is clean.