Thanks for taking our opinion.
Any abnormality in the breast should be evaluated by an expert as soon as possible. This is necessary to pick up & treat breast cancer
at an early & treatable stage. Please don't take the impression that I am suspecting this in you. This is rather a differential that always need to be excluded. However painful lesions in lactating breast are more likely to be inflammatory & can easily be treated.
You should see a General surgeon
as soon as possible.