Mastitis involves inflammation, and severe cases can lead to inflammatory lumps. Generally, we use breast ultrasonography for diagnosis and differentiation. If the ultrasonography report indicates a cystic formation, it is typically considered to be caused by the accumulation of milk. At this point, ceasing breastfeeding and seeking massage from a professional or a loved one to clear the accumulated milk can be curative. If the ultrasonography report shows an inflammatory hard lump or a solid mass, we recommend stopping breastfeeding and starting anti-inflammatory symptomatic treatment. If the lump shows signs of shrinking, continue the anti-inflammatory symptomatic treatment. However, if there is no change in the inflammatory lump, surgical treatment is recommended to remove the inflamed mass.