Hello i have a lipoma in my breast it hurts after my period and if i streach my arm too much should i be worried or tell my dr? thank you

Tell your doctor: Especially if it is a new or changing finding. It is likely benign and may be a fibrocystic nodule. But your doctor should be made aware of changes & yiu may need a reevaluation depending on when your iast breast ultrasound was done. Also be aware that fibrocystic nodules frequently & normally become more tender with the menstrual cycle.

Yes tell your MD: Lipomas usually will not cause pain, may be benign fibro-cystic disease , you should have an examination by your doctor , to make sure nothing serious , if need will order tests or refer you to a specialist