Ringworm is highly contagious and can spread from infected person and even pet animals. The symptoms usually develop between 1-2 weeks post infection and generally include itchy skin, ring-shaped rash and hair loss. Ringworm is a common fungal infection of the skin caused by dermatophyte fungi that have adapted to live on keratin, the hard fibrous protein found in skin and hair. Ringworm of the body is related to athlete's foot (tinea pedis), jock itch (tinea cruris) and ringworm of the scalp (tinea capitis). Ringworm often spreads by direct skin-to-skin contact with an infected person or animal. Mild ringworm often responds to antifungal medications applied to the skin. Ringworm is a contagious fungal infection that causes a circular, ring-like pattern on your skin. It’s contagious and requires treatment with antifungal medications.