There are many things that could cause bruises in the breast.The most common is injury to fragile blood vessels that could cause a hematoma (bleeding) underneath the skin thus forming a lump. Sometimes, something as simple as bumping into something will cause a bruise and very often we may not even remember when or how it happened. The little lump and bruise can be due to other benign causes such as fibrocystic changes in the breast.Cysts or Fibroadenomas (both benign lumps) are very common in women having this condition. Also keep in mind that most breast lumps are not cancerous and in my opinion, the chances that the bruise and little lump in your breast are related to cancer is really small, but you know that it's hard to tell for sure over the internet what this lump may represent without medical attention. Since there is a history of BRCA 2 in the family, I would advise you to see a Breast Specialist who may consider genetic testing for BRCA 1 and 2, which can be inherited from either side of the family.This could be important information in regard to the level of BC risk for you and for children you may have in the future.
All the best.