These fungi thrive best on skin that is moist, hot, and hidden from the light. Up to 20 percent of the population has one of these infections at any given moment. Ringworm is very mildly contagious. Some people are much more susceptible than others. Those with eczema or other skin problems get ringworm more easily because the protective barrier of the skin's outer layer is less intact.
Children are more susceptible before puberty.
Boys get it more easily than girls. Several of these antifungal creams are now available without a prescription. Treatment may require several weeks. Only by treating for at least one week after the resolution of symptoms can one guarantee eradication. As soon as treatment has begun it's fine for her to play with others, but it's best not to share clothing or to let other children rub the patch of ringworm.