Pityriasis alba is a common skin condition that occurs mainly in children. It causes slightly scaly, round or oval patches on the skin. The patches may look slightly pink at first. Later they fade to leave areas that are lighter than the other skin. They most often appear on the face, neck, upper arms, or upper part of the body. The cause of pityriasis alba is not known.
The patches aren't harmful. They may be more noticeable in children with darker skin.
Pityriasis alba usually goes away without treatment. It may take a few months or years for the color in your child's skin to return to normal. Using moisturizers, creams, or petroleum jelly may help relieve dry or itchy skin.