Picture of Juvenile Xanthogranuloma
Juvenile xanthogranulomas (JXG) are raised skin lumps that are usually red, orange or tan at first, but over time may become more yellowish-tan in color. The bumps are a collection of cells called histiocytes and their cause is not known. JXGs are seen mainly in infants and young children, but these can also develop later in life. They generally appear on the head, neck, and trunk although they can appear on any location of the body including the lung, liver, heart, kidney, and bone marrow. JXGs are benign and usually painless.
Text Source: Nationwide Children's
American Osteopathic College of Dermatology