My husband uses a pen to deliver insulin for his diabetes. It was making knots and his blood sugar numbers were still too high. I noticed him rubbing the place after he gave himself the shot. I asked if it hurt. He said he was trying to get the insulin to disperse instead of making a knot. I asked if it helped. He said it didn't, he still had knots and still had high blood sugar numbers.
I got the Pampered Chef Pie Roller (I thought about a rolling pin first but decided the pie roller was better). He agreed to try it. He hasn't had a knot since he started rolling it after giving himself a shot and his blood sugar numbers are better!