Welcome to icliniq.com.
I totally understand your concern.
First of all, there is no suspicious mass on the mammogram (attachment removed to protect patient identity). Secondly, breast tissue is more prominent on the right, which might happen during lactation depending on which side you use more for breastfeeding and mild mastitis. Lastly, the lump you feel might be a small lymph node.
In a nutshell, there is no suspicious lesion on the mammogram. Please let me know if you have any further questions.
The Probable causes:
Asymmetric breast tissue, mild mastitis.Preventive measures:
Breastfeeding with the normal side.