Hormones sometimes cause breast growth in male children. This is called gynecomastia. Using some medicines also can cause breast growth. Usually it starts as a rubbery or firm lump (breast bud) under the nipple. Your child may have a breast bud on one or both sides. In babies, the small lump usually goes away in a few weeks to a few months after birth. In teenage boys, breast buds may be about the size of a nickel or quarter. They may last up to 1 to 2 years.
Many infant and preteen boys get this breast growth. It likely upsets your son to have lumps in his breasts. Tell him that this is common and that they should go away on their own.
Talk with your doctor if you or your son is concerned about the size or shape of his breast growth.
Follow-up care is a key part of your child's treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if your child is having problems. It's also a good idea to know your child's test results and keep a list of the medicines your child takes.
Watch closely for changes in your child's health, and be sure to contact your doctor or nurse call line if:
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Current as of: March 14, 2017
Adam Husney, MD - Family Medicine
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