[sfem]

In my experience, you'll know it when you feel it. Tissue growth for me felt more solid under the skin, more compact and was kind of like moving something firm and coherent under the skin. Fat is like fat on any other part of your body. It can be squeezed, squished, reshaped, moves more fluidly. The budding is the first semi-solid core that forms under the nipple, and can be felt as reacting differently from the surrounding flesh when you try to press down or sideways on it. Like a cooked meatball versus uncooked ground beef.