Blueberry muffin syndrome refers to presence of bluish-red on skin. The condition usually arises in infants. Following are the possible causes of blueberry muffin syndrome: - hemolytic disease of the newborn - congenital infections such as rubella, cytomegalovirus, parvovirus, herpes simplex - syphilis - twin-twin transfusion syndrome - hereditary spherocytosis - congenital leukemia cutis - neuroblastoma - rhabdomyosarcoma Reference: https://dermnetnz.org/topics/blueberry-muffin-syndrome#:~:text='Blueberry%20muffin%20syndrome'%20is%20the,or%20spreading%20cancer%20(metastases). Image via: https://casereports.bmj.com/content/2015/bcr-2014-208473