lumps

Does anyone use a heated massager to prevent lumps after injecting with an insulin syringe? This website does not mention massagers. https://www.medtronicdiabetes.com/loop-blog/lumps-and-bumps-from-insulin-therapy/

Hey guys, I keep getting a hard lump after I do my subQ injection into my belly. I've been using a 27ga 1/2" needle. What am I doing wrong? I've been training a lot and my body fat has been dropping drastically, I'm probably around 8% body fat now. Should I start injecting somewhere else...