I don't have this. I was running into scar tissue problems several years ago, and that's actually what led me to TuDiabetes. now I rotate very carefully, and am using more sites on my backside. Here are some good discussions on the subject:
https://forum.tudiabetes.org/topics/has-anyone-experienced-lipotrophy
https://forum.tudiabetes.org/topics/583967:Topic:218784 (Injection sites and fat lumps)
https://forum.tudiabetes.org/topics/very-bad-scar-tissue-may (Richard157 has had type1 about 65 years)
https://forum.tudiabetes.org/topics/i-m-getting-super-lumpy