Common puberty change
Why is there a lump or tenderness under my nipple?
Temporary breast tissue growth, called pubertal gynecomastia, is common in boys. It can affect one or both sides and often becomes smaller over time.
~50%
About half of teenage boys may notice it.
Estimates vary by source and definition. The important point is that a tender disc or fullness under a nipple during puberty is common and does not mean a boy is becoming female.
What usually happens
- It may feel tender or firm beneath the nipple.
- One side may be more noticeable.
- It often improves over months to a few years.
- Chest fat and glandular tissue are not the same thing.
Arrange a routine appointment
if the change is very large, painful, persistent, worrying, or associated with medication, supplement, or drug use.
Get prompt medical evaluation
for a hard fixed lump, nipple discharge, skin dimpling, significant redness, fever, or another rapidly changing symptom.
Sources and limits: The American Academy of Pediatrics describes pubertal breast tissue as common and usually temporary. Exact prevalence estimates differ across studies and definitions. AAP breast growth guide AAP boys development
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