Fungal infections on the skin are common. They are caused by fungal organisms, also known as tinea or dermatophytes. These organisms cause ringworm, athlete’s foot, and jock itch. When fungus infects the skin, it mostly grows near the skin’s surface where it causes red scaling patches that can itch. Depending on the location and extent of your fungal infection, topical or oral antifungal medications may be prescribed to clear it. Although rare, in some people, such as in those who are immunosuppressed, very elderly, or are infants, fungus can sometimes spread beyond the skin into the blood stream. If this occurs, the affected person is usually very sick with fevers and chills, and he or she should seek immediate medical attention.