Mongolian spots on the arms of babies, most of them fade naturally by the age of 5 years, and a few patients may persist into adulthood.
Mongolian spots are congenital benign gray-blue spots, common in yellow babies, present at birth, probably due to embryonic development, melanocytes from the neural crest to the epidermis during the migration, stay in the deep dermis and the formation of the lumbar-sacral, buttocks and other parts of the lumbar-sacral region, can be round, oval and other different shapes, its surface is flat, smooth, no discomfort symptoms.
Most of the Mongolian spots can subside naturally before the age of 5, and a few of them can last until adulthood (commonly seen in patients with multiple Mongolian spots), but they do not affect the health of the body and generally do not need treatment. It is recommended to strengthen observation in daily life and seek medical treatment when abnormalities occur, such as accompanied by other skin damage, blue-gray patches protruding from the skin surface, etc.
It is recommended that when the baby has Mongolian spots on the arm, do not be overly nervous, generally will subside on its own, but daily life need to strengthen observation, and when abnormalities occur, you need to consult a doctor in a timely manner.