Hormone activity: In puberty there is a surge in baseline hormonal activity & males have a small amount of estrogen in their system normally. Breast tissue in some males is more sensitive to even small amounts and up to half will have transient breast tissue enlargement during puberty.It usually fades within 6-12 mo.Persistance or development of breast tissue at other times suggests an abnormality.
Answered 4/25/2020
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