They sound like cysts. Potassium iodide cures/prevents breast cysts.
Hi,
Pimples or sebaceous cysts which is often the result of swollen hair follicles can occur on the breast like on skin anywhere else on your body.
The chances that this is cancer are doubtful.... Usually these types of pimples or cysts go away on their own, but since they are not going away you should really see a dermatologist for a clinical evaluation.This condition should be treated and perhaps needing a course of antibiotics.
Take care..