Final answer:
The correct term for the abnormal or excessive development of the male breast is Gynecomastia, due to an imbalance of hormones such as estrogen or testosterone.
Step-by-step explanation:
The term that describes abnormal or excessive development of the male breast is Gynecomastia. This condition can occur due to hormonal imbalances, where there may be an excess production of hormones like estrogen or a lack of male hormones, potentially due to a primary issue with the testes or a secondary issue related to the pituitary gland. As compared to the other options given: Hypotrophy would suggest underdevelopment, Mastitis refers to inflammation of the breast tissue, and Hyperplasia generally describes an increase in the number of cells in a tissue or organ, not specifically the abnormal growth of male breast tissue.