First of all, a cancerous lump would be fixed, hard, irregularly shaped and almost always painless,but tender and movable lumps that appear and disappear are NOT indicative of breast
cancer. As I mentioned before, these lumps in your breast
are most likely cysts
or Fibroadenomas which are both benign in nature.I wish I could help you more to alleviate your fears,but we cannot diagnose anything over the Internet…. These lumps have to be investigated to know exactly what they are.