the lump your talking about is like an abscess but without all the fluid. So don't worry if you get one, it will eventually go away on it's own. Those lumps are like a 50 / 50 chance but are extremely painful. It's not always what you do that makes it happen. During my last cycle i got 2 of them. I was doing glute shots and i didn't notice it at first until it was extremely painful to sit down. So i looked in the mirror with my wife and noticed that i had a huge lump kinda looked like another ass cheek. It went away after about 2 or 3 days. But i literally could not sit down or lay down for those couple days. When you do your shots make sure you alternate the area, and also rub the area for about 2 minutes after you take the shot to help spread the test around. Even with all these precautions i was still able to get 2 of them so like i said earlier it's a 50 / 50 but don't sweat it if it happens but hopefully it won't.