May 7, Gynecomastia is a condition that makes breast tissue swell in boys and Thyroid problems, since hormones from that gland control growth and.
Oct 2, testosterone can cause swelling of the breast tissue in boys or men. Generally, gynecomastia isn't a serious problem, but it can be tough to.
A girl may worry that a lump under the nipple is abnormal or a sign of a serious medical problem when it is a part of normal breast development.
Condition: Breast Problems (breast lumps/cysts/masses, breast pain, breast abscess, gynecomastia, Gynecomastia may occur in % of teenage boys.