Symptoms of ringworm can include a flat rash that may or may not be in the shape of a circle or ring, an itching or burning sensation, scaling and peeling, and discomfort. Other symptoms of ringworm may vary according to the area of the body affected by the infection. 

Although ringworm may affect any part of the body, it tends to thrive in areas that are warm and moist, like skin folds and the groin area, where it is called jock itch. Jock itch, or tinea cruris, affects the genitals, anal region, and inner thigh areas, showing up as an itchy red round rash, similar to other ringworm infections. 

When ringworm grows on the outside of hair shafts or on the scalp, it is called tinea capitis. Tinea capitis is caused by a mold spore-like fungus and can lead to bald patches, pus-filled sores, itchiness, a fever, and swollen lymph nodes on the neck. As the infection continues, the bald patches may continue to get larger, with small black dots visible on the center of each. 

Ringworm can also grow on the nails, a condition known as onychomycosis. Nail infections are commonly caused by the candidiasis fungus, or yeast. Ringworm infections of the nail are characterized by a yellowing or thickening of the nail itself, a change in the shape of the nail, brittleness, or a noticeable deformity. 

The fungus that causes ringworm is extremely common throughout the world and the U.S. The fungi that cause ringworm infections live on people, pets, and in the soil, and it is most commonly spread by direct person-to-person contact. Occasionally, it may be transmitted through direct contact with infected animals. Symptoms of scalp and body ringworm infections may begin within four and 14 days of contact with the fungus.

Although ringworm infections can affect people of all ages, children are at particular risk for certain types of infection at particular life stages. Infants and toddlers are at high risk for scalp ringworm, while children with pets may be more likely to suffer ringworm of the body. Older children and teens who are involved in sports activities may be more susceptible to athlete's foot and jock itch. 

Ringworm infections are generally quite distinctive, but only a doctor can accurately diagnose this common but irritating fungal infection. Use of over-the-counter or prescription anti-fungral treatments may be recommended for up to two to four weeks.