Ringworm is a common fungal infection caused by a worm. Anyone can get ringworm, itching, or skin allergy. It can affect anyone easily who has compromised immunity and also found in children. Red scaly ringworm, circular patch on the skin, or at nails are the signs of fungal infection. It affects the scalp and arms, can appear at any part of the body, athlete's foot and jock itch are common forms of ringworm.