 [ Symptoms ] finished my breast cancer treatment joints in my finger are red and swollen it wakes me up all night from painful numbness [ Disease ] you are correct it would be highly unusual never seen it in fact for a 14 year old to have a breast cancer so the most logical lump for you to have would be a cyst some can be very firm fibrocystic mass and many will seem to change in size around your menstrual period it would be best to have any lump or mass properly examined so a visit to your primary care medical provider is indicated you are to be complimented for being aware of these changes first let me say good for you for noticing this lump also you are very well informed for your age which will help you better manage your health and wellness bravo you are right that it is not unusual for developing breasts to feel lumpy you are also right that breast cancer is rare in your age group but you still should get that lump checked out for one thing you will have some peace of mind for another thing your health care provider can further educate you about what to expect as your breasts continue to develop i recommend you make an appointment soon with your primary care provider he or she can help you figure out what is going on here best wishes to you