Notice a firm, rubbery lump directly under the nipple or areola
Check for swelling in one or both breasts
Look for breast tissue that feels more like gland than fat
See whether the nipple area is tender or sensitive
Compare both sides for uneven enlargement
Notice if the chest looks more rounded or puffy than usual
Check whether the enlargement is centered around the nipple
Consider whether the change developed during puberty, after starting a new medication, or with hormone changes
Distinguish it from chest fat, which is usually softer and more diffuse
Get evaluated by a healthcare professional if the enlargement is new, painful, growing, or only on one side