man is unable to shed his beer-belly even after exercise,the reason leaves him and the doctors astonished

Malignant Tumor

It is generally termed as malignant tumor as it arises in mesenchymal cells, where abnormal fat cells in deep tissues multiply in number in an unregulated manner. Hence, causing a big lump of mass in the limb or abdominal area. It can rarely become into a large mass but in the case of Kavin, it had worsened due to lack of proper diagnosis.