Picture of Cradle Cap
Cradle cap (also called seborrheic dermatitis) is a rash that begins as scaling and redness on a baby's scalp. This condition is a noninfectious skin condition and is a form of eczema. Seborrheic dermatitis is common in infants, usually beginning in the first weeks of life and slowly disappearing over a period of weeks or months. The condition rarely is uncomfortable or itchy.
The precise cause of the rash is not known; however, Pityrosporum ovale (a yeast) is believed to play a role in this condition.
Image: Ian Boddy / Photo Researchers, Inc.
Text: "Skin Conditions: Childhood Skin Problems", WebMD Medical Reference