Cradle cap, also called infantile seborrheic dermatitis, is an oily, patch of thick white, yellow, or brown scaly skin. Though it commonly occurs on the scalp, it can also occur on the ears, nose, eyelids, and groin. Doctors believe that it is caused by the oil glands and hair follicles in the baby’s skin producing too much oil. It may also be caused by a fungus called malassezia yeast that grows in the scalp's oil glands.  It is not contagious, not caused by an allergy, and is generally not itchy. It is not dangerous and usually clears up on its own within a few weeks to a few months, but you can take actions to speed along the process.